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1、六年級解方程專項練習200題（有答案） 一=--- 72 2.4 (45) (1)X-1=1, 418 ⑵xx2x_L=& 3147 (3) J-4x=l, 46 (4) 8X2.5-2x=13.6 (5) 0.78:x=3:5, (6) 1-20%x=0.4, (8) 1-(x-1)=6, 2 (9) 2x-Jx=1.2, 5 (10) 9X3-1.7x=13.4, (11) x-25%x=24, (12) W+0.2”， 452 (13) 0.6x+90%x=78, (14) 20%x-2.4X3=0.8, (15) 2x-』x=4

2、2, 32 (16) 0.6x+3X2.5=67.5, (17) 1」+(x-0.45)=51, 53 (18) x-2.25=8.25, (19)&x=3:12,4 (20)2x+0.8=5.6, 5 (21) 1.4:x=1:0.75, (22) xX(2-&=24, (23) 4x (24) 12x+7X0.3=20.1, (25) &+4二1 236 (26) x：42=1：10, (27) i-X0.5+』x=r， 1223 (28) 0.8:3=0.48:x, 12 (29)x-x. (30) 42:第X:下 57 (31) 5

3、x-0.4=75%, (32) 6x-0.9=4.5,(33)2(x-3)=5.8,(34)1.6x=6.4,(35)4x-3X9=29,(36)16+8x=40, (37) x+1.1=3, (38) -l+2x=l, 42 (39)2_X3-7x=1.04,100 (40) Ax-1-工x=2, 23 (41) x-2x=14, 9 (42) 3x-2x=&, 419 (44) 1.2:2=2, 35 1S=3_.3= 工1015 (46) -L：l=x：0.8, 205 (47) x.W&1, 46 (48) 1-25%X+25%x=+25%x

4、4 (49) O?251.6 —XX=ix—, (50) 425 (51) 5:8=x：32, (52) 2x+3X0.9=24.9, ，…八…4 (53) 5.3x-2.9x=-, 5 ,、6，一…、， (54) jx(7—2.8x)=1.5, ,、BR (55) x：0.3=-: 93 (56) 150%x+66=99 (57) x+6-0.8x=16 x-5Hx=5.5 3JL+(X-W)=1.3 10 (X+0.5):2-i=(X-4) 2 X+0.05=3.528, 2X-4X6=80, 4X4.5-3X=6.38, 4X-7.2=10

5、, 11.5X+X=20, 3.8X12+15X=87.6, 6X+5=17, 0.6X(2.5+X)=4.2, -：-=X: 43 105 27x=18 15' 22 45' 5一52-26' 4(—+x)=—, 413 -X0.25+Wx- 524 _16 x 6、5 200:6=x： 4+X= 5 12 8(x-2)=2(x+7), 365 —:18%=^, 20X —-2x=—, 52 23 -x+-x=46, 54 i：x」： 435 1.66.4 5(3x-4)-2(x-1) 6k-18 83' =5(2

6、x-1) (88)3(x+4.5)=60,(89)1.6x+2.4=7.52,(90)3(x-0.8)=6.3,(91)28.4—5x=5.8, (92)x 1= 625 (93) .l+2x=—,22 (94) x=15% 20' (95) ±x一-±x=-±-,3515 (96) x+50%x=6, (97) x=0.3:12, (98) 4x+2(8-x)=26, (99) -x--=0,34 (100) 32 上+Wx=1,55 (101) xX(1+2)="， 3519 (102) 1e3舄 (103) （咤工二28,

7、(104) x產Yr (105) XX.七 (106) 5x+35=650, (107) 720+3x=80, (108) 3.6x-0.9x=8.1, (109) 4X4.5—3x=6, (110) 10-2.5 x0.限 (111) 6X3-1.8X=7.2, (112) 21一J 1003' (113) 3八x--=42,14 (114) 51_19 —x+-=—, 8520 (115) 7x+3=8.19, (116) 12:0.6=x: 2 (117) 3(x+2)=4(x+1), (118)3x —70%x=9.2

8、, (58) (59) (60) (61) (62) (63) (64) (65) (66) (67) (68) (69) (70) (71) (72) (73) (74) (75) (76) (77) (78) (79) (80) (81) (82) (83) (84) (85) (86) (87)

9、 (119)6+芭x=240, (120) 5 22.5—0.4x=12.5, (153) (154) (155) 7.8-3x=3.6, 10: X3-1.8x=7.2,x=4.5:0.8, (121) (122) (123) (124) x：3.5=4:21,3 x-0.8x-6=16, 15C —:—二x：8, 33 O,U15/ 0.062 (156) (157) (158) (159) (160) (125) x:15=&X, 96 (161) (126) 9111 -￡x+.ix=_

10、, 3424 (162) (163) (127) (128) (129) xX50%--lx=5, 3 33 1-馬二幺, 45 24 2.5+1^x=3-, 37 (164) (165) (166) (167) (168) x (130) 3&-21=4, 62 (131) 8.5-3x=21, 2 (132) (133) 3±-x=4, 6 3~， -x-5%=17.54, 4 (134) 21 蕓：(4-x), 73 I： 4 _=x： 8 X-7.65=4.64, 28.25-X=8.25, X-(3

11、.6+2.97)=12.42, 」二3 —,x=—, 38 金-14.5=5.5, 8 x-80%x=4日 75%x-5X-=6, 5 x-6.8=15.4 1.9x=5.7, 4.3y—y=4.65x+2.6=7.6,—1.5=12.9 (169)9x+5x=8.4, (170)6.8+3.2x=14.8 (171) (172) (173) 5-+x=—, 911 (135) (136) (137) (138) (139) (140) (141) (142) (143) (144) 6x+31=49, (174) (175) (

12、176) 7x 32.8 +3=8.19, ；-9x=17.5, -0.36x=16, 6X7+3x=69, 6x+2x—56=0, 3x 5.8x 8.4 3x (145) (146) (147) (148) (149) (150) (151) (152) (178) (179) (180) -0.45X4=2.7, -4.6x=0.96, +(9-x) +1.2=8, 5x+28=71, 8.7-1.2x=3.9 8x—2.6x=37.8 (181) 二3, 0.75x-0.95X4=8.5, 54+2+3x=72, 8x

13、-2.6=37.8, 152 —x—=—, 4815 x+30%x=26, (182) (183) (184) (185) (186) 3 (187) (188) (189) (190) 2_lx=lx^^— 362 4.5X--dx=1.5, 32 (1+25%x=0.5, x-40%x=9 xX20%=15.2, 315 —x——x=, 51013 2c, -x-75%=3, 3 4x-興14=2.4, (x-4.5)X6=12.5, 27-17x=13.4, 9.6+3x=3.24X5,2x+5=5x-7, (x-2)=2-5

14、(x-2),4x-3(20—x)+4=0, 二1, 4x-5X6=12, 8x-3x=15.6, (191) (192) (193) 30X(x+4)=60,7.2X0.5—3x=1.2,5x—2.4X5=8, (194) (195) 2+A=.?x2,548 5x+2.4X15=66, (196)

15、 3.2x+2.8x-x=1, (197) 2.5X16-8x=12, (198) 9.6-3x=6.3, (199) 5(x+6)=75, (200) x+0.7+0.9X3=4, 解方程專項練習200題答案: (1)x-二旦 48 _； —v=， 418 3v43v4 4333 x= (2)x 2 X±X——, 3147 ix=l -LxX21=Wx21, 217 21 x=12 3 (3) 4 4x=—, 6 -4x+4x=—+4x, 6 =—+4x— 666 7 12 4=4x+4, x= 43 (4)

16、 8X2.5—2x=13.6 20 —2x=13.6, 13.6+2X=20 2X=6.4 x=3.2; (5) 0.78:x=3:5, 3x=0.78X5, 3x=3.9, x=1.3 (6) 1-20%x=0.4, 1-20%x+20%x=0.4+20%x 0.4+20%x=1, 0.4+20%x-0.4=1-0.4, 20%x=0.6, 20%xxl￡O=0.6xl￡O, 2020 x=3; (8) 1+(x--)=6, 2 1+(x--)x(x--)=6X(x-—), 222 1=6x(x-1), 2 6x-6x3=1, 2 6x-

17、3=1, 6x=4, 6x+6=4+6, Y-2 x=一 3 ,、4 (9) 2x--x=1.2, 5 x(2--)=1.2, 5 —x=1.2, 5 —x-^—=1.2 555 x=1; (10) 9X3-1.7x=13.4, 27-1.7x=13.4, 27-1.7x+1.7x=13.4+1.7x, 13.4+1.7x=27, 13.4+1.7x-13.4=27-13.4, 1.7x=13.6, 1.7x+1.7=13.6+1.7, x=8 (11) x-25%x=24, 75%x=24, 75%x+75%=2咨75% x=32; (

18、12) -^x--+0.2=-, 452 Jx-0.6=JI, x=10.5 Jx-0.6+0.6=1+0.6, 42 (19)學：x=3:12, 4 3x= Jx=_H, 410 _W=W, 44104 x=1— 3x 12, 4 +3=9+3, x=3 15 (13)0.6x+9

19、0%x=78, 1.5x=78 1.5x +1.5=78+1.5, (20)Jx+0.8=5.6, 5 - —x+0.8—0.8=5.6—0.8, 5 3- -x=4.8, 5 x=52 (14)20%x-2.4X3=0.8,20%x-7.2=0.8, 20%x—7.2+7.2=0.8+7.2, 35c5 qxx3=4.8X‘, 3 53 x=8 20%x+20%=&20% (21)1.4 x=1.4 :x=1:0.75, X0.75, x=40 x=1.05 (15)—x--x=42, 32 —x=42, 6 (22)x (2-

20、3=24, 5 X=24, 5 -x--=42-—, 666 x=252 X&+^=24+', 5 55 x=20 (16)0.6x+3X2.5=67.5, 0.6x+7.5=67.5 (23)4x 0.6x+7.5 —7.5=67.5—7.5, 0.6x=60 4x-14=44 0.6x +0.6=60+0.6 x=100 4x=4, 4x+4=4+4,x=1 (17)1--(x-0.45)=△, 53 (24)12x+7X0.3=20.1, 12x+2.1=20.1 --(x-0.45)X(x-0.45) 5 (x-0.45),

21、12x+2.1 12x -2.1=20.1-2.1, +12=18+12, 嶼-2.4=1.6, 3 雪-2.4+2.4=1.6+2.4, 3 16, ——x=4, 3 x=1.5 125 (25)—x+—x—, 236 3' x= x= (18) x-2.25=8.25, —2.25+2.25=8.25+2.25, (26)x：

22、 10x=42X至, 7 10x+10=30+10, x=3 (27) ilx0.5+L=Q ,22汩 0.75+—x=3.75, 2 0.75+工x-0.75=3.75-0.75, 2 -x=3, 2 L+_1=3+ 222 x=6; (28) 0.8:A=0.48:x, 12 0.8x=Ax0.48, 12 0.8x=0.2, 0.8x+0.8=0.2+0.8, x=x= 4 (29) x-"x=?, 55 26 ￡x=—, 55 x-3+3=2.9+3,x=5.9; (34)

23、1.6x=6.4, 1.6x+1.6=6.4+1.6,x=4; (35) 4x-3X9=29,4x-27=29,4x-27+27=29+27,4x=56, 4x+4=56+4, x=14; (36)16+8x=40,16+8x-16=40-16,8x=24, 8x+8=24+8,x=3; (37)x+1.1=3, x-1.1X1.1=3X1.1, x=3.3 x?= —x、 5'55'5 x=3; (30)42:1x：下 57 (38)A+2x=l, 42 工+2x-1=1-1, 4 +2=1-2, 4 8 442 2x= 2x x= (3

24、9)工_X3-7x=1.04, 100 ^x=42X鳥 57 2.16-7x=1.04, 2.16-7x-1.04=1.04— 1.04, ”3。仔 x=50; (31) 5x-0.4=75%, 5x-0.4+0.4=75%+0.4, 5x+5=1.15+5,x=0.23 (32) 6x-0.9=4.5, 6x-0.9+0.9=4.5+0.9 6x=5.4, 6x+6=5.4+6, x=0.9; (33) 2(x-3)=5.8, 2(x-3)+2=5.8+2x—3=2.9, 1.12-7x=0, 7x+7=1.12+7, x=0.16; (40)-x

25、-1--x=2, 23 -x-1=2, 6 -x-1+1=2+1, 6 x=18; ，，、2， (41)x--x=14, 9 _Zx=14, x=1 _x—_=14—- 9'9'9 x=18; (42)3x-J*x=l^, 419 3=&, 419 x= (43)'=Q：26 72

26、2.4 2.4x=72X0.26, (48) 1-25%X+25%x=+25%x 4 0.25x+0.25-0.25=1-0.25, 0.25x=0.75, x=3; 4=JL, (49) 0,251.6 0.25x=1.25X1.6, 0.25x+0.25=1.25X1.6-0.25, x=8; -xX=;X^ (50) 425 _!xx+Ux—二工， 4425,4 2.4x=18.72 2.4x+2.4=18.72+2.4, x=7.8 (44)1.2: 2_x 2-x=1.2 3 X5, (51)5:8=x：32,8x=5X32, 8x+

27、8=5X32+8,x=20 (52)2x+3X0.9=24.9, -x=6, 3 2 .x—-=6 3 -3 x=9 (45) 183 10 15' Jlx=18xJL, 1015 x=1二x= 105 x.='：. x.5 1010510 x=12; (46)A：l=x：0.8, 205 —x=—x0.8 520 —x-=0.04 55 x=0.2 (47)x瓷鳥1, 46 二3X3-llxJ = 4464 2x+2.7=24.9, 2x+2.7-2.7=24.9-2.7, 2x+2=22.2+2, x=11.1 (53)

28、5.3x-2.9x=2 2.4x= cc4c 2.4x-2.4=--2.4, 5 (54)9X(7—2.8x)=1.5,7 Ex(7-2.8x)7 7-2.8x=2.1, 7-2.8x+2.8x=2.1+2.8x, 7-2.1=2.1+2.8x-2.1, 4.9+2.8=2.8x+2.8, x=1.75; (55)x：0.3=-: 93 85 -x=0.3x上， 39

29、 _§x工黃=工二旦 3-36-3 x= x 16 (56) 150%x+66=99 1.5x+66=99 1.5x=33 x=22 (57) x+6-0.8x=16 0.2x+6=16 X=52; (64)4X4.5-3X=6.38, 18-3X=6.38, 18—3X+3X=6.38+3X, 6.38+3X=18, 6.38+3X-6.38=18-6.38, 3X=11.62, 3X+3=11.62+3, X= 畫. 150

30、 0.2x=10 x=50 衛(wèi)-三1 2 (58) - x=14.4 3 - 5%"5. 5 (59 ) 0.55x=5.5 x=10 4X=17.2 (60 ) 3-^+ (X-W ) =1.3 10 5 (X- -) x ( x- -) =1.3 x (x--), 5 5 5 c 9 ，c c c 3 —=1.3x - 0.78 , 10 3 —+0.78=1.3x - 0.78+0.78 , 10 4.68=1.3x , 4X +4=17.2+4, X=4.3 ; (66) 11.5X+X=20, 12.5X=20 , 12.5X- 1

31、2.5=20 + 12.5 , X=1.6 ; (67) 3.8 X 12+15X=87.6 , 45.6+15X=87.6 , 45.6+15X - 45.6=87.6 - 45.6 , 15X=42 , 15X +15=42+15, X=2.8 (68) 6X+5=17, 4.68 + 1.3=1.3x + 1.3 , x=3.6 ; (61) (X+0.5) : 24=(X— 4) 2 9-lx (x-4) = (x+0.5) X_l, 2 4 6x+5 -5=17-5, 6x +6=12+6, x=2 ; (69) 0.6 X ( 2.5+X) =4.

32、2 , 0.6 X (2.5+X) +0.6=4.2 +0.6, 2.5+x=7 2.5+x —2.5=7 — 2.5 , x=4.5 —10 ― -X 4=—x+ -lx 0.5 , 2 4 4 (70) W： 2=X:旦 4 3 15 工3-lx, 4 4 8 4 3x=4X (65)4X-7.2=10,4X-7.2+7.2=10+7.2 2.25x-10+10=0.125+10, 2.25x+2.25=10.125+2.25, x=0.6 x=4.5 (62) X+0.05=3.528, X+0.05X0.05=3.528X0.05, X=0.

33、1764; (63) 2X-4X6=80, 2X-24=80, 2X-24+24=80+24, 2X=104, (71) 10_AV22 271845 旦1 2731 10_27 27x10^8110 (7”啜硬 ?帝奇寶君力 x=80 (78)4+X/, 5 14^3 143 小乂一 -14=1- 14 4-XXX=±X, 5 二X=4, 5 15 10-Xxl0 3—15乂3 15, 2x+2=4+2, 555 X=10 『9, (73)堂二￡』§二且, 15飛2.26 (79)8(

34、x-2)=2(x+7), 8X 6X -16=2X+14, —16=14, 6X=30 X=5 '5-14 (80) 55一145’ (74)4(-+x)-里, 55 U+4x-芯=理-理 4x=4 x=1 (81) 5 且：18%=L5, 20X -1x=0.18X6.5, 20 3 —X=1.17, 20 X=7.8 —-2x=i, 52 2x+2x=--+2x, 2 ,、4—1 (75)-X0.25+ 5r 0.2+ x=：, 24 —+2x=, 25 1o141 +2x—二— 2252 0.2+ 10%

35、― 3x-0.2=-T-0.2, 2x= x= (76)x- 1X-U x- 220 2x x= +2二1+2, 10 -x+-x=46,(82)54 56 談一5’ z2x(5 =46, —x=46, 20 x= “5' %.&-46嚼 2020 (77)200: 6x=200 12 6=x：—, 5 xI：： ， x=40; ,、12 (83)x— 43 6x+6=480+6, 4-1x6 —x=—八—, 345

36、 310 2 -2=3-2x— 3 3103 (84)上且旦 2z 1.6x=6.4X2, 1.6x=12.8, 1.6x+1.6=12.8+1.6,x=8 (85)5(3x—4)—2(xT)=5(2xT) (90)3(x-0.8)=6.3, 3x-2.4=6.3, 3x-2.4+2.4=6.3+2.4 3x=8.7, 3x+3=8.7+3, x=2.9; (91)28.4-5x=5.8, 2

37、8.4-5x+5x=5.8+5x, 5.8+5x=28.4, 5.8+5x-5.8=28.4-5.8, 5x=22.6, 5x+5=22.6+5,x=4.52 15x-20-2x+2=10x-5, 13x-18=10x-5, 13x—18-10x=10x-5-10x, (92)x: 25x= 3x 3x 3x=13 3x x= (86) 83 3(6x-1)=64,18x-3=64, 18x-3+3=64+3, 18x=67, 18x+18=67+18, x=' x= 13 -18=-5, -18+18=-5+18, +3=13+3, 3

38、 =一 625 1x3,6 25x= 25x x= (93) 50' —+2x=—,22 +2x= 2x=0 x=0 (94)-?--x=15% 20T (87) 8(2X-7)=5(X+13),16x-56=5x+65, 16x—56—5x=5x+65—5x, 11x-56=65, 11x-56+56=65+56, 11x=121, 11x+11=121+11, x=11, (88) 3(x+4.5)=60,3(x+4.5)+3=60+3,x+4.5=20, x+4.5—4.5=20—4.5, x=15.5 (89) 1.6x+2.4=7.52

39、, 1.6x+2.4-2.4=7.52-2.4, 1.6x=5.12, 1.6x+1.6=5.12+1.6, =-xXx=15%x， 20 0.15x=0.15, 0.15x+0.15=0.15+0.15, x=1 ,、21 (95)—x——x= 35 71 —x=一, 1515 15' -x15 (96) 15 15 15' x= x+50%x=q 1.5x=6 1.5x+1.5=6+1.5, x=4 x=3.2

40、 (97)x=0.3:12, 4 0.3x=彳 0.3x+0.3=9+0.3, (103)( x=30 (98)4x+2(8-x)=26,4x+16-2x=26, x=20 2x+16=26 (104)x 2x+16 2x -16=26-16, +2=10+2, x=5 (99)2x-J=0,34 2x--^+J=0+J, 3444 lx=3 x= 34 13 ,￡xx3=^X3, 34 511 —

41、x=l—， 714 5門 75 x= (105)xx 14 X1 乂5’ x= 85 x= (100) 9 一? 4 2+2x=1, 55 22 (106)5x+35=650,5x+35-35=650-35, 5x=615 宜+2x- 55 22 —x=一, 55 3 5’ 5xx=123 +5=615+5, 252 ±xX^=-X 525 (107)720+3x=80, 720-3xX3x=80X3x, 240x=720, 240x+240=720+240, x=1 (101)xx x=3 22 19' (1

42、08)3.6x-0.9x=8.1, (3.6—0.9)x=8.1, 11 —x= 15 Uxx 22 19' 151119 If x= — 19 2.7x=8.1 2.7x x=3 +2.7=8.1+2.7, (109)4X4.5—3x=6, 18 18 -3x=6, -3x+3x=6+3x, 6+3x=18 6+3x -6=18-6, 3x ,1_1 1———, %2 3 +3=」；, 3x=12, 3x+3=12+3,x=4 (110)里/LJ e0.8 2.5x=10 X0.8, x= 2.5x+2.5=8+2.

43、5, (111)6X3-1.8X=7.2, 2.3x=9.2 18-1.8X=7.2, 18-1.8X+1.8X=7.2+1.8X, 7.2+1.8X=18 7.2+1.8X—7.2=18—7.2, 1.8X=10.8 1.8X+1.8=10.8+1.8, X=6 (112)工L+x= 100 x= 2」

44、 1003 x= (113)x--l=42, 14 x=42 x=9 (114) 5X+1. x+ 85 <+.=1 —x+—=, S520 1=19.1 ， 5205 包=* 84 x= (115)7x 7x+3=8.19, +3X3=8.19X3, 7x=24.57 7x +7=24.57+7, x=3.51 (116)12: 0.6=x 0.6x=12 : 2 1 2 2.3x+2.3=9.2+2.3, x=4; (119) 6+^x=240, 5 6+A-6=240-6, 5 二x=234, 5 衛(wèi)x+

45、迄234+2, 555 x=390 (120) 22.5-0.4x=12.5, 22.5-0.4x+0.4x=12.5+0.4x, 12.5+0.4x=22.5, 12.5+0.4x—12.5=22.5—12.5, 0.4x+0.4=10+0.4, x=25; (121) x：3.5=4:2-, 3 2lx=3.5X4, 3 2lx-21=14-2i, 333 x=6 (122) x-0.8x-6=16, 0.2x-6=16, 0.2x-6+6=16+6, 0.2x+0.2=22+0.2, x=110; (123)。：2=x：8,33 4=8x1,

46、 33 -xx2=8xlxJ, 3232 0.6x=6 x=4; (124)爪二 0.062 0.6x+0.6=6+0.6, x=10 (117)3(x+2)=4(x+1), 3x+6=4x+4 3x+6-3x=4x+4-3x, x+4=6, x+4—4=6—4, x=2 (118)3x-70%x=9.2, 3x—0.7x=9.2, 0.06x=2X0.015, 0.06x+0.06=0.03+0.06, x=0.5; (125)x：15二： 96 2x=15X-H, 69 1°…，4” —xx6=15x—x6, 69 x=40;

47、 (126)2x+lx=H, 3424 L=1- x= 1224 8.5 3x+2 3x+3x=2工+3x, 2 .1=8.5, 2 Uxx_12=Uxl2,12112411 3x+2 2 -21=8.5-也, x= 3x=6 3x+3=6+3, (127)xX50%-lx=5, 3 x=2

48、 (132)3'+x=4, .lx=5, 6 6 x=30 Lx6=5X6, 4x=3 (128)1--x=2 45 4=更+4, 6 1—-zx+-5x=—+—x, 4454 x= 23 24 (133)/x—5%=17.54, 4 3+3x. +x 54 1=11 解: 3~ jx-5%+5%=17.54+5% -xx4 x= 33 --=17.59:—— 44 (129) 15' x=23 75' 2.5+1x=3; 37 (4—x), 2.5+12x- 3 5 2.5=3&-2.5, 7 15 解：

49、4 2 -x=—x-, 273 —x=—,314 x+x=「 2221 1X x= HIT 9 21' 14 」「二x 2122 2' (130) 3月x-2-1=4, 62 x=3 17 21 3至x—2』+24=4+22, 6222 -x=6-, 62 (135)6x+31=49 6x+31-31=49-31, 6x=18 6x+6=18+6, x= 1_5 =3-=6—-3一, 626 39 x=3 23' (131)8.5-3x=2-i, (136)7x+3=8.19,7x+3X3=8.19X3,7x=24.5

50、7, 7x+7=24.57+7, x=3.51 (137)32.8-9x=17.5, 32.8-9x+9x=17.5+9x,17.5+9x=32.8, 17.5+9x-17.5=32.8-17.5, 9x=15.3, 9x+9=15.3+9,x=1.7; (138) x-0.36x=16,(1-0.36)x=1

51、6,0.64x=16, 0.64x+0.64=16+0.64,x=25; (139) 6X7+3x=69,42+3x=69, 42+3x-42=69-42,3x=27, 3x+3=27+3,x=9; (140) 6x+2x-56=0, (6+2)x-56+56=0+56,8x=56, 8x+8=56+8, x=7 (141) 3x-0.45X4=2.7,3x-1.8=2.7,3x-1.8+1.8=2.7+1.8,3x=4.5, 3x+3=4.5+3,x=1.5; (142) 5.8x-4.6x=0.96, 1.2x=0.96, 1.2x+1.2=0.96+1.2,x=

52、0.8; (143) 8.4+(9-x)=3, 9-x=8.4-3, 9-x=2.8, x=9-2.8, x=6.2; (144) 3x+1.2=8,3x+1.2X1.2=8X1.2,3x=9.6, 3x+3=9.6+3,x=3.2 (145) 5x+28=71,5x+28-28=71-28, 5x=43, 5x+5=43+5, x=8.6; (146) 8.7—1.2x=3.9, 8.7-1.2x+1.2x-3.9=3.9+1.2x-3.9, 4.8=1.2x, 1.2x=4.8, 1.2x+1.2=4.8+1.2, x=4; (147) 8x-2.6x=

53、37.8, 5.4x=37.8, 5.4x+5.4=37.8+5.4,x=7; (148) 0.75x-0.95X4=8.5, 0.75x-3.8=8.5, 0.75x-3.8+3.8=8.5+3.8, 0.75x=12.3, 0.75x+0.75=12.3+0.75, x=16.4,; (149) 54+2+3x=72,27+3x=72, 27+3x-27=72-27, 3x=45, 3x+3=45+3,x=15; (150) 8x-2.6=37.8, 8x-2.6+2.6=37.8+2.6, 8x=40.4, 8x+8=40.4+8,x=5.05 48S1

54、5 x= z\ 4 AxX4=— 12 X4, 15' (152)x+30%x=26, (1+30%x=26, 1.3x=26 1.3x+1.3=26+1.3 x=20 (153)7.8-3x=3.6 7.8-3x+3x=3.6+3x 3.6+3x=7.8 3.6+3x-3.6=7.8-3.6, 3x=4.2, 3x+3=4.2+3,x=1.4 (154)6X3—1.8x=7.2,

55、 18 18 -1.8x=7.2, -1.8x+1.8x=7.2+1.8x工14.5+14.5=5.5+14.5 8 18=7.2+1.8x 18 —7.2=7.2+1.8x 工=20, s 10.8=1.8x 10.8 +1.8=1.8x+1.8 x=6 Ex8=20X8, 8 x=160 (155)10: 4.5x=10 x=4.5:0.8, X0.8, (162)x-80%x=48 (1—0.8)x=48,

56、 4.5x=8 4.5x +4.5=8 +4.5 , 0.2x=48 0.2x+0.2=48+0.2 x= 16 x=240 9' (163)75%x- (156)- 4 —=x： 8 10' 0.75x x= JLx=—x 34 1x=1 x S40 8408 0.75x 0.75x=9 (157) X-7.65=4.64, X-7.65+8.67=4.64+7.65, X=12.29 (158)28.25-X=8.25, 28.25-X+X=8.25+X, X+8.25=28.25, X+8.25—8.25=28.25

57、—8.25, X=20 (159) X-(3.6+2.97)=12.42 -6.57=12.42, —6.57+6.57=12.42+6.57, X=18.99 (160) Lx=3 一?x, 38 i3 上+xXx=- Xx, 3X=1 x= S3 x= x= I； (161)3—14.5=5.5, 8 5X2=6, 5 -3=6, 3+3=6+3, 0.75x+0.75=9+0.75 (164) (165) x=12 x-6.8=15.4, —6.8+6.8=15.4+6.8 x=22.2 1.9x=5.7, 1.9x+1

58、.9=5.7 x=3; (166)4.3y- 3.3y=4.6 +1.9 y=4.6 3.3y+3.3=4.6+3.3, 46 y= 33' (167)5x+2.6=7.6, 5x+2.6—2.6=7.6—2.6, 5x=5 5x+5=5+5,x=1 (168)x-1.5=12.9, x-1.5+1.5=12.9— x=11.4 (169)9x+5x=8.4 14x=8.4 14x+14=8.4 x=0.6 (170)6.8+3.2x=14.8 6.8—6.8+3.2x=14.8 3.2x=8 14, —6.8 3.2x+3.2=8+3.2,

59、x=2.5 (171)52-x=—, 911 至+xxx=JJ5x, 911 5_10y =x 911 』x=JL, 213 2x+_!=JL+_l, 22132 x= 111111 西 x= 10. 13 (172)Z 3 9 x- -x=, 62 (179)-x-75%=3 3 2x+75%K75%=3<75% 3 Z-.lx

60、+Jlx=JL+Jlx, 36626 2x=J!, 34 -=_-+Jix, 326 :x 1—=zv 3 2=9-2 ^一一?一) 343 2-1=1+lx-1 32262 11. x= —=—x, 66 ULL1-1 x—一 (180) 27 T ,3 4xyX14=2.4, 4x —6=2.4, 66 x=1 4x=2.4+6 x=8.4 +4, (173)4.5X1-3-x=1.5, 32 x=2.1 1.5 1.5 -3.5x=1.5,—3.5x+3.5x=1.5+3.5x1.5=1.5+3.5x (181)

61、—:x=—:4.5, 95 1.5 —1.5=1.5+3.5x-1.5, 0=3.5x —x=4.5X—, 59 ±x=2, 5 +3.5=3.5x+3.5,x=0 x=2 (174)(1+25%x=0.5, x=5 1.25x=0.5 1.25x+1.25=0.5-1.25, (182)(x- 6x x=0.4 6x (175)x-40%x=9, 0.6x=9, 0.6x+0.6=9+0.6, 6x 4.5)X6=12.5, -4.5X6=12.5, —27=12.5, -27+27=12.5+27, 6x=39.5 6x x=15

62、 x=6 (176)xX20%=15.2,xX20%+20%=15.2+20%x=76 +6=39.5+6, 5 (183)27-17x=13.4, 27-17x+17x=13.4+17x (177)30x-30=180, 30x-30+30=180+30, 30x=210, 30x+30=210+30, 13.4+17x=27, 13.4+17x-13.4=27-13.4 17x=13.6 17x+17=13.6 +17, x=7 x=0.8 3 (178)-x- 5 —x=一, 1013 (184)9.6+3x=3.24 9.6+3x—9.6=

63、16.2 X5, —9.6, 3x+3=6.6+3,x=2.2 (185) 2x+5=5x-7, 2x+5-2x=5x-7-2x, 3x-7=5,3x-7+7=5+7,3x=12, 3x+3=12+3, x=4; (186) 3(x-2)=2-5(x-2), 3x-6=12-5x, 3x-6+5x=12-5x

64、+5x, 8x-6=12, 8x-6+6=12+6, 8x=18, 8x+8=18+8, x=2.25; (187) 4x-3(20-x)+4=0,7x-56=0, 7x-56+56=0+56, 7x=56, 7x+7=56+7, x=8; (188) —^=1, 46 y+2_2y3x24=1X24, 46 6(y+2)-4(2y-3)=24, 30-2y=24, 30-2y+2y=24+2y, 2y+24=30, 2y+24-24=30-24, 2y=6, 2y+2=6+2, y=3 (189) 4x-5X6=12,4x-30=12,4x-30

65、+30=12+30,4x=42, 4x+4=42+4,x=10.5; (190) 8x-3x=15.6, 5x=15.6, 5x+5=15.6+5,x=3.12; (191) 30X(x+4)=60, 30X(x+4)+30=60+30, x+4=2,+4X4=2X4, x=8; (192) 7.2X0.5-3x=1.2,3.6-3x=1.2, 3.6-3x+3x=1.2+3x, 3x+1.2=3.6, 3x+1.2-1.2=3.6-1.2, 3x=2.4, 3x+3=2.4+3,x=0.8 (193) 5x-2.4X5=8,5x-12+12=8+12,5x=20

66、, 5x+5=20+5,x=4, (194) W+Nx=￡x2, 548 Uxx義江x型， 2019419 x=. 19 (195) 195)5x+2.4X15=66, 5x+36=66, 5x+36-36=66-36,5x=30,5x+5=30+5,x=6; (196) 3.2x+2.8x-x=1,5x=1,5x+5=1+5,x=0.2; (197) 2.5X16-8x=12, 40-8x=12, 40-8x+8x=12+8x, 8x+12=40, 8x+12-12=40-12, 8x=28, 8x+8=28+8,x=3.5. (198) 9.6-3x=6.3,9.6-3x+3x=6.3+3x, 6.3+3x=9.6, 6.3+3x-6.3=9.6-6.3, 3x=3.3, 3x+3=3.3+3,x=1.1; (199) 5(x+6)=75,5x+30=75, 5x+30-30=75-30,5x=45,5x+5=45+5,x=9; (200) x+0.7+0.9X3=4,x+0.7+2.7=4,x+0.7+2.7-2.7=427,