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1、六年級解方程專項練習(xí)200題（有答案） (1)x-1.=J,4、8 (9)2x-且x=1.2, (2)xX—X二一,3147 (10) 9X3—1.7x=13.4, (3)E-4x=-1, 46 (11) x—25%x=24, (4)8X2.5—2x=13.6 (12) 41 x--+0.2=—, 52 (5)0.78:x=3:5, (13) 0.6x+90%x=78, (6)1-20%x=0.4, (14) 20%x-2.4X3=0.8, 、21 (15)-x—■rx=42, 32

2、 (16 ) 0.6x+3 X 2.5=67.5 , (23) 4x -隼運 4 4 (17) 1型+(x-0.45)=51, 63 (24) 12x+7X0.3=20.1, (18) x-2.25=8.25, (25) L+二 x=5 兀' (19) *x=3:12, 4 (26) x： 42=1：10, (20) 為+0.8=5.6

3、,5 (27) X0.5+—x= 2 (21) 1.4:x=1:0.75, (28) 0.8: 12 =0.48:x, (22)xX(2一 4 后)=24, (29) (30) 42: J=x : 5 (39)工Lx3-7x=1.04,100 (31)5x—0.4=75%, (40) —x-1x=2, (32)6x—0.9=4.5, (41) x--

4、x=14, 9 (33)2(x—3)=5.8, (42) "IKI (34)1.6x=6.4 (43) 工=工26 722.4 (35)4x—3X9=29, (44) 1.2: (36)16+8x=40, (45) 蟲曾.馬 x10,15 (37)x+1.1=3, (46)—:—=x：0.8, 205 (38)+x=1

5、 (47)x__=1：+1, -46 (55)x：0.3=至：J,93 (56 ) 150%x+66=99 (48)1-25%X+25%x=+25%x) 4 (57)x+6-0.8x=16 ~xX~X—,(50):!2 — (58)34 (51)5:8=x:32, 3… -x-5依5.5 (59), (52)2x+3X0.9=24.9, (60)3-^--(X--)=1.3 105 (53) LCCC4 5.3x—2.9x=—, 5 (61)

6、(X+0.5):▲=(X-4): 24 (62 ) X +0.05=3.528 , 5一…■ (54)jx(7-2.8x)=1.5, 2X—4X6=80, 4X4.5—3X=6.38, 4X-7.2=10, 11.5X+X=20, (72) (73) (74) (75) 41R 上X0.25+￡9, 524 (63) (64) (65) (66) (67) (68)

7、 (69) (70) (71) (76 ) 斗&x：與 4 3 15 10 5b22 27* 18 45 3.8X12+15X=87.6, 6X+5=17, 0.6X(2.5+X)=4.2, (78)4+X二 (79)8(x-2)=2(x+7), (80) JL：18%=^, 20 (81) 生2x=1,52 -^=x+—x=46, (82) (83) x= (84) (85) 5(3x—4)—2(x—1)=5(2x—1) (86

8、) Sk-1-3 (87) 8(2X—7)=5(X+13), (88) (89) (90) (91) 3(x+4.5)=60, 1.6x+2.4=7.52, 3(x—0.8)=6.3, 28.4—5x=5.8, (92)x: (93) (94) (95) _l+2x=l, 22 20 +x=15% lx-

9、 (96) x+50%x=q (105) (105) 送礙 (97)三x=0.3:12,4 (98)4x+2(8-x)=26, (99) -lx—-=0, 34 (100) (106)5x+35=650, (107)720+3x=80, (108)3.6x—0.9x=8.1, (101) 1292 xx(&上) 3519 (109)4X4.5—3x=6, (102) (110) (103) x=28,

10、 (111)6X3-1.8X=7.2, (120) 22.5 — 0.4x=12.5 , (112) +x=-L,3 (121) x：3.5=4:火 (113) —=42, 14 (114) (122) x-0.8x—6=16, (115) 7x+3=8.19, (123) 17- —:—=x：8, (116) 12:0.6=x: (124) 0.015 0.062 (117) 3(x+2)=4(x+1), (125) 5il (118)3x —70%x=9.2, (126) "x

11、=' x^-x 3ra[24 (119)6+噎x=240, (127) xX50%--x=5, 3 (128)1-2x=-J,45 (136)7x+3=8.19, (129)2.5+14=3±3T (137)32.8—9x=17.5, (130)3⑤-21=4,62 (138)x-0.36x=16, (131)8.5-3x=21,2

12、 (139)6X7+3x=69, (132 ) 3士+ x=4, (140)6x+2x-56=0, (141) 3x — 0.45 X 4=2.7 , (133)馬-5%=17.54,\4 (134) —:==—:(4-x),273 (142) 5.8x—4.6x=0.96, (143) 8.4+(9—

13、x)=3, (135)6x+31=49 (144)3x+1.2=8, (153)7.8-3x=3.6, (145)5x+28=71, (154)6X3—1.8x=7.2, (146)8.7—1.2x=3.9, (155)10:x=4.5:0.8, (147)8x-2.6x=37.8, (156)工 4 —=x：—, 310 (148)0.75x—0.95X4=8.5, (149)54+2+3x=72, (157)X-7.65=4.64,

14、 (158) 28.25-X=8.25, (150) 8x - 2.6=37.8 , (151) (160) (159) X-(3.6+2.97)=12.42, -x=3 x 38 (152)x+30%x=26, (161)年—14.5=5.5,8 (172) (162) x—80%x=4日 x=l!2 911 (163) 75%x-5XJJ=6, 5 (172) lx=l ——x=—, 2 (164) x-6.8=15.4 (173) 4.5X_1-3Lx=1.5, (

15、165) 1.9x=5.7, (174) (1+25%x=0.5, (166) 4.3y—y=4.6 (175) x-40%x=9 (167) 5x+2.6=7.6, (176) xX20%=15.2, (168) -1.5=12.9 (178) 工x二1013' (169) 9x+5x=8.4, (170) 6.8+3.2x=14.8 (179) 2 《x+75%=3

16、 (180)4x-jxi4二工4, (189)4x-5X6=12, (182)(x—4.5)X6=12.5, (190)8x-3x=15.6, (183)27-17x=13.4, (191)30X(x+4)=60, (192 ) 7.2 X 0.5 - 3x=1.2 , (185) 2x+5=5x - 7, (193 ) 5x - 2.4 X 5=8, (186

17、) 3 (x — 2) =2- 5 (x-2), (194 ) 2, (187) 4x- 3 (20 —x) +4=0, (195) 5x+2.4 X 15=66, (184)9.6+3x=3.24X5, 1963.2x+2.8x-x=1 (197)2.5X16-8x=12, 1989.6-3x=6.3， 1995(x+6=75， (200)x+0.7+0.9X3=4, 解方程專項練習(xí) 200題答案: (2)xxWx」=±3147 1+(x->!)x(x--L)=6X(x」), 222 1=6x(x-1), 2 6x-6X_1=1, 2 6x-3

18、=1, 6x=4, 6x+6=4+6, 2 3 x= xx- 21 _LxX21=21, 217 x=12 (9)2x-^x=1.2, 5 ,14. x(2--)=1.2 5 ￡x=1.2, 5 _2x-^_=1.2+國， 555 (3) --4x+4x=—+4x, G +4x— (6 +4=4x+4, 12 x= 工 48 (4) 8X2.5—2x=13.6 20 —2x=13.6, 13.6+2X=20 2X=6.4 x=1; (10)9X3-1.7x=13.4, 27-1.7x=13.4, 27-1.7x+1

19、.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; x=3.2 (5)0.78 3x=0.78 x=3: 5, X5, 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, *1 —x—0.6+0.6=—+0.6, 42 311 -x

20、= 410' 20%x=0.6 20%xX 100 lo： =0.6,嚶 44104 x=1 x=3 T 15 (8)1+(x— 2)=6, (13) 0.6x+90%x=78, 1.5x=78, 1.5x+1.5=78+1.5, x=52; (14)20%x-2.4X3=0.8,20%

21、x-7.2=0.8, 20%x-7.2+7.2=0.8+7.2, 20%x+20%=&20% x=40; (15)三-_lx=42, 32 .lx=42, _1x+_l=42+-l, 666 x=252 (16)0.6x+3X2.5=67.5,0.6x+7.5=67.5, 0.6x+7.5—7.5=67.5—7.5, 0.6x=60, 0.6x+0.6=60+0.6, x=100; (17)1二+(x-0.45)=八,53 (20)2x+0.8=5.6, 5 Jx+0.8-0.8=5.6-0.8, 5 2x=4.8, 5 Exx昱4.8xW, E忸

22、3 x=8. (21) 1.4:x=1:0.75,x=1.4X0.75,x=1.05 (22) xX(2-_l)=24, 5 xX至=24, xx上+W=24+至, 55同 x=20; (23) 4x-圣我, 4x-^+?=31+?, 4flM1 4x=4, 4x+4=4+4,x=1 (24)12x+7X0.3=20.1, 士+(x-0.45)X(x-0.45)=1^(x-0.45),53 12x+2.1=20.1 12x+2.1-2.1=20.1-2.1, 亞x-2.4=1.6,3 2.4+2.4=1.6+2.4, 16y :x=' x= (18

23、) x-2.25=8.25, —2.25+2.25=8.25+2.25, x=10.5 (19) 3 4, x=3:12, 3x= 予12,4 12x+12=18+12, x=1.5 ,、5T人 (26)x：42號10, 10x=42X以， T 10x+10=30+10, x=3 x=3 3=

24、9+ 3, (27)2-X0.5+-x=s-, 2 0.75+.lx=3.75, 2 0.75+lx-0.75=3.75-0.75, 2 -lx=3, \2 —x-^—=3-^—, 322 x=6; (28)0.8:旦0.48:x, 12 0.8x=JLx0.48, 12 0.8x=0.2, 0.8x+0.8=0.2+0.8, x=1 x= 4 79QX3_S (29)X--X%， x-3+3=2.9+3,x=5.9; (34) 1.6x=6.4, 1.6x+1.6=6.4+1.6,x=4; (35) 4x-3X9=29,4x-27=

25、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 (38) -i+2x=i, 42 l+2x-1=1-1, 4424 x=3 (30)42: 2x-2=1-2, 4 3=42X x=50 (39)工Lx3—7x=1.04,100 2.16-7x=1.04, 2.16-7x-1.04=1.04— 1.04, 1.12 (31)5x-0.4=75%,

26、 5x-0.4+0.4=75%+0.4, 5x+5=1.15+5,x=0.23 7xx=0.16 -7x=0, +7=1.12+7, (40)—x-1x=2, 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+2 —3=2.9, —x-1=2, 6 4-x-1+1=2+1, x=18; 一、2… (41)x--x=14,

27、 x -lx=14,9 x=1 x=18 (48)1-25%X+25%x=+25%x 4 0.25x+0.25—0.25=1—0.25, (42)3x-2x=2^, 419 0.25x=0.75 x=3 1.25=X (49)0.251.6, 0.25x=1.25X1.6, 0.25x+0.25=1.25X1.6-0.25, x= x=8 -xx4x-1, 2.4x=72X0.2

28、6, 2.4x=18.72, 2.4x+2.4=18.72+2.4, x= x=7.8 (44)1.2: 2Lx (51) 8x=5 5:8=x：32, X32, 4=1.2X5, 8x+8=5X32+8,x=20 4=6, (52)2x+3X0.9=24.9, 2x+2.7=24.9 2x+2.7 2x -2.7=24.9-2.7 +2=22.2+2, x=9 (45) _±x=18X-^ 10 x=11.1 (53)5.3x-2.9x=$, 5 2.4x= 2.4x 3X= x一 10 +2.4=冬+2.4, x= _x_

29、一」x (7-2.8x)=1.5, x=0.2 (47)x4-^=-^+1,46 —X(7 7 、5 2.8x)+3=1.5- 7 4.9 (55)x： -2.8x=2.1, —2.8x+2.8x=2.1+2.8x -2.1=2.1+2.8x +2.8=2.8x+2.8 x=1.75 0.3=—:二, 93 x=0.3X— 9

30、 第二邳二E 3T36-3 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 0.2x=10 x=50 2X-24+24=80+24, 2X=104, 2X+2=104+2,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=14.

31、4 -k-5髯x=5.E (59)- 0.55x=5.5 x=10 (60) 3——+(X— 10 號=1.3 C 3一+ 10 X(x- 3 =1.3x(x-), 旦=1.3x-0.78, 10 Jl+0.78=1.3x-0.78+0.78, 10 (65) 4X-7.2=10,4X-7.2+7.2=10+7.2,4X=17.2, 4X+4=17.2+4,X=4.3; (66) 11.5X+X=20, 12.5X=20, 12.5X-12.5=20+12.5,X=1.6; (67) 3.8X12+15X=87.6, 45.6+15X=87.6

32、, 45.6+15X-45.6=87.6-45.6,15X=42, 15X+15=42+15, X=2.8 4.68=1.3x 4.68 +1.3=1.3x+1.3, (68)6X+5=17, 6x+5-5=17-5, 6x+6=12+6, x=2; x=3.6 2.25x (69)0.6X(2.5+X)=4.2, 0.6X(2.5+X)+0.6=4.2+0.6, 2.5+x=7, 2.5+x—2.5=7—2.5, x=4.5; 2.25x -10+10=0.125+10, +2.25=10.125+2.25,x=4.5 (62)X+0.05=3.52

33、8, X+0.05X0.05=3.528X0.05, X=0.1764; (63)2X-4X6=80, 2X-24=80, （71）梟$嘴 2T iosi15' x= (77)200: 6=x： 6x=200 Z-T-TJ5 514 ,一?二二;一, 55145 4x=4 x=1 (75

34、)—X0.25+—x=^, 524 0.2+ 1 —x= 2 0.2+ -^■x-0.2=— 2■ x= _x=_ 220 (76)x-is4 6x+6=480+6,x=80 (78)什 4-XXX=?X,5 -X=4, 5 9 X+—=4 5 X=10 (79)8(x-2)=2(x+7), 8X 6X (80) (81) 4 -16=2X+14, —16=14, 6X=30 X=5 工18%=^,20X -Ax=0.18X6.5,20 -^-X=1.17, 2。 X=7.8 r2xi 2x+2x 14 —+2x=

35、^, 25 —+2x- \2 2x= 2x+2=衛(wèi)+2, 10 _±x+2^x=46, (82)E4 x(N+J)=46, E4 一 x=40 (84)='== 2x 1.6x=6.4X2, 1.6x=12.8, 1.6x+1.6=12.8+1.6,x=8 (85)5(3x-4)-2(xT)

36、=5(2xT) 15x-20-2x+2=10x-5, 13x 13x 3x 3x 3x=13 3x x= (86)^2=S,83 3(6x-1)=64,18x-3=64, 18x-3+3=64+3, 18x=67, 18x+18=67+18, -18=10x-5, -18-10x=10x-5-10x, -18=-5, -18+18=-5+18, +3=13+3, 13 3' x=匚[18(87)8(2X-7)=5(X+13), 16x-56=5x+65, 16x-56-5x=5x+65—5x, 11x-56=65, 11x-56+56=65+5

37、6, 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, 1.6x+2.4-2.4=7.52-2.4, 1.6x=5.12, 1.6x+1.6=5.12+1.6, x=3.2; (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, (92) -

38、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 25x= 2 25x+25w+25, x= J-. 50 (93) l+2x=1, 22 工2x-4]-1, 2222 2x=0, x=0;

39、(94) JL+x=15%, 20 —二xXx=15%x, 20' 0.15x=0.15, 0.15x+0.15=0.15+0.15,x=1; _J+±x- 55 2x=2 55 x=1 (101)xx(工浮)=^-, 19 —x=-^,1&19 11 _x八與二X里15111911 xX x= (102)J-3K二 4 19 2 葉-飆+3x制+3 >>> 3x (96)x+50%x=q 1.5x=6 1.5x x=4 +1.5=6+1.5, x= (97)Wx=0.3:12,

40、 4 0.3x= 0.3x+0.3=9+0.3, x=30 (98)4x+2(8-x)=26,4x+16-2x=26, 9哼28Xl x=20 2x+16=26 2x+16 2x -16=26-16, +2=10+2, x=5 1q(99)-x--^=0,34 x= (105)xX _9 x=疝 x= 85 22 (106)5x+35=650, 5x+35-35=650-35, 5x=615, 5x+5=61

41、5+5, x=123; (107) 720+3x=80,720+3xX3x=80X3x,240x=720, 240x+240=720+240,x=3; (108) 3.6x-0.9x=8.1,(3.6-0.9)x=8.1,2.7x=8.1, 2.7x+2.7=8.1+2.7, x=3; (109) 4X4.5—3x=6, 18-3x=6, 18-3x+3x=6+3x, 6+3x=18, 6+3x-6=18-6, 3x=12, 3x+3=12+3,x=4 (110)1°=工*,x0.82.5x=10X0.8, 2.5x+2.5=8+2.5,x=3.2; (111)

42、6X3-1.8X=7.2, 18-1.8X=7.2, x=— [5 (115) 7x+3=8.19, 7x+3X3=8.19X3, 7x=24.57, 7x+7=24.57+7, x=3.51; (116) 12:0.6=x:工，2 0.6x=12xl, 2 0.6x=6, 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 18T.8X+1.8X=7.2+1.8X, 7.2+1.8X=18, 7.2

43、+1.8X-7.2=18-7.2, 1.8X=10.8, 1.8X+1.8=10.8+1.8, (118)3x-70%x=9.2, 3x-0.7x=9.2, 2.3x=9.2, 2.3x+2.3=9.2+2.3, X=6 (112) x=4; (119)6+-|x=240, x= "J,10。3 6+^x-6=240-6, 5 x= 上x=234, 5 工 10。 (113)x+ —=42, 14 x=42 旦 14' x=9 -=234— R!■ x=390 (120)22.5-0.4x=1

44、2.5, 22.5-0.4x+0.4x=12.5+0.4x 12.5+0.4x=22.5 12.5+0.4x 0.4x —12.5=22.5—12.5, +0.4=10+0.4, x=30 x=25 (121)x：3.5=4:2-1, —3y+3y=3+3y^x+—x^—x,4454 -ix=3.5X4, 3 Ji+^x=1, 54 21x+21=14-21, 333 x=6 3+3y_3_13 l_l^_x^=1) 5 (122)x-0.8x—6=16, —xX 1 0.2x 0.2x 0.2x -6=16

45、, -6+6=16+6, +0.2=22+0.2, x= (129) 15 2.5+1—x=3^, x=110 (123) 8, 2.5+1Zx-2.5=3上 x 三xX 3 3 3i x—=8xAx 23 x=4 x= (124) 0.06 (130) 9 14 志x-J=4, 62 0.06x=2X0.015, 0.06x+0.06=0.03+0.06, 3士x-21+21=4+21, 6222 x=0.5 一、.4 (125

46、)x：15=二: 9 —x=6—, 62 赳3H+限 x= 工X6=15X6 -x6, 絲. 23 x=40 (131)8.5—3x= (126 ) x= 11 (127) xX50%- t-x=5, —xX 6=5X6, 目 8.5-3x+3x=2—+3x, 2 3x+2-i=8.5, 2 3x+21-叢=8.5- 222 3x=6, 3x+3=6+3, x=2 (132)成+x=4,6 5 3——-xXx=4Xx, 6 4x=3 —, 6 4x

47、 +4=3 至+ 4, x= 上 24 (133)型x-5%=17.54, 解： 工一5%+5%=17.54+5% 4 X .2=17.59 + ± x=23 二； 75 (134) —: -§=—: (4-x), 2 7 3 丁一十一 x=3 17 21 (135) 6x+31=49 6x+31 -31=49-31, 6x=18 , 6x +6=18+6, x=3 ; (136) 7x +3=8.19, 7x+3X 3=8.19 X 3, 7x=24.57 , 7x + 7=24.57 + 7, x=3.51 ; (137) 32.8 - 9x=17

48、.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=16, 0.64x=16 , 0.64x +0.64=16 + 0.64 , x=25 ; (139) 6 X7+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,

49、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=0.8; (143) 8.4+(9-x)=3, 9 -x=8.4-3, 10 -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

50、+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=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 4.5x=8 0.75x=12.3, 0.75x+0.75=12.3+0.7

51、5, 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 4.5x+4.5=8+4.5, x= (156)工：A=x： -x= —x= lx=l ^^x^^^^— 340 x= (157) 151)L+E= 4S15 (152)x+30%x=26, (1+30%x=26, 1.3x=26, 1.3x+1.3=2

52、6+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)6X3T.8x=7.2, 18-1.8x=7.2, 18-1.8x+1.8x=7.2+1.8x, 18=7.2+1.8x, 18-7.2=7.2+1.8x-7.2, 10.8=1.8x, 10.8+1.8=1.8x+1.8, x=6; (155)10:x=4.5:0.8, 4.5x=10X0.8, 1 5 X-7.65=4.64,

53、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—8.25, X=20 (159)X-(3.6+2.97)=12.42, -6.57=12.42, (160) —6.57+6.57=12.42+6.57, X=18.99 -x-3 x 38 ■H x= x= xx, lx —八 3 I； (161)W—14.5=5.5, 14.5+14.5=5.5+14.5, =20, —x8=20X8,8

54、 x=160 (162)x—80%x=48 5 5」0_10乂」0 9 11 11 11 (1-0.8)x=48, 0.2x=48, 0.2x+0.2=48+0.2, x=240; 5 x (166) 4.3y - y=4.6 , E 6 6網(wǎng) 6 x=1 ; (173) 4.5

55、 xA - aix=1.5 , 3 2 1.5 - 3.5x=1.5 , 1.5 - 3.5x+3.5x=1.5+3.5x , 1.5=1.5+3.5x , 1.5 - 1.5=1.5+3.5x - 1.5 , 0=3.5x , 0 + 3.5=3.5x + 3.5 , x=0 (174) (1+25% x=0.5 , 1.25x=0.5 , 1.25x -1.25=0.5 - 1.25 , x=0.4 ; (163) 75%x-5x2=6, 0.75x-3=6, 0.75x-3+3=6+3, 0.75x=9, 0.75x+0.75=9+0.75, x=1

56、2 (164) x-6.8=15.4,x-6.8+6.8=15.4+6.8 x=22.2; (165) 1.9x=5.7, 1.9x-1.9=5.7-1.9,x=3; 3.3y=4.6 3.3y+3.3=4.6+3.3, 46 (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=12.9-1.5,x=11.4; (169) 9x+5x=8.4, 14x=8.4, 14x+14=8.4+14, x=0.6; (170) 6.8+3.2x=14.8,

57、(171) -6.8+3.2x=14.8-6.8, 3.2x=8, (172)/-1xJ, 3S1 -—二xJx, 36616 2,l+ly 32網(wǎng) 322回2 1 6 (175) x-40%x=Q 0.6x=9, 0.6x+0.6=9+0.6, x=15; (176) xX20%=15.2, xx20盼20%=15.2-20%x=76 3.2x+3.2=8+3.2, x=2.5 (171) (177)30x-30=180, 30x-30+30=180+30, 30x=210, 30x-30=210-30, 5 10

58、 —=—X , 9 11 x=7 (178)汽 5 13 5 x= 2132 10. 13 (179)4+75%=3 x= 27 (180) 4x一 s ”4二2?4, 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+5x, 8x-6=12, 8x-6+6=12+6, 8x=18, 8x+8=18+8, x=2.25;

59、 x=3.12 3x=6.6 4x —6=2.4, + 4, ■? 4x=2.4+6x=8.4x=2.1 (181) 2- —x=4.5義 x=2 x=5 (182) (x—4.5)X6=12.5, 6x—4.5X6=12.5, 6x-27=12.5, 6x-27+27=12.5+27, 6x=39.5, 6x+6=39.5+6, (183) 27-17x=13.4, 27-17x+17x=13.4+17x, 13.4+17x=27, 13.

60、4+17x-13.4=27-13.4, 17x=13.6, 17x+17=13.6+17, x=0.8; (184) 9.6+3x=3.24X5,9.6+3x—9.6=16.2—9.6, (187) 4x-3(20-x)+4=0,7x-56=0, 7x-56+56=0+56, 7x=56, 7x+7=56+7,x=8; (188)史入巨12=1,46 X24=1X24, 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 (18

61、9) 4x-5X6=12, 4x-30=12,4x-30+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, (191) 30X(x+4)=60, 30X(x+4)+30=60+30, x+4=2, x+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

62、-2.4X5=8, 5x-12+12=8+12, 5x=20, 5x+5=20+5,x=4, 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=4-2.7, x+0.7=1.3, x+0.7X0.7=1.3X0.7,x=0.91. (194)冬冬上X2, (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