六年级解方程专项练习进步200题(有规范标准答案)

1、*-六年级解方程专项练习 200题（有答案）(1) x - 1. =J, 4、8(9) 2x-且x=1.2 ,(2) xx2x 1=4, 3 14 7(10 ) 9X 3 1.7x=13.4 ,(3)E- 4x=,46(11) x - 25%x=24,(4) 8 X 2.5 2x=13.6(12 )x-+0.2=,4 52(13 ) 0.6x+90%x=78,(5) 0.78 : x=3: 5,(6) 1 - 20%x=0.4,(14 ) 20%x- 2.4 X 3=0.8 ,、2 1(15 ) x-x=42,J (16 ) 0.6x+3 X 2.5=67.5 ,(17 ) 1 芝+ (x -

2、 0.45 ) =51, 63(24 )12x+7X 0.3=20.1 ,(18 ) x- 2.25=8.25 ,(25 )Ix+ixi(23) 4x -隼运4 4(19)型:x=3: 12,4(20 )与+0.8=5.6 ,(27 )X 0.5+-lx=,2(21) 1.4 : x=1 : 0.75 ,(26 ) x： 42=1: 10,(28 ) 0.8 : 工=0.48 : x,12(22) xX (2-=24,(30) 42:二x : 5(39)% X3 - 7x=1.04 ,100(31) 5x 0.4=75%,(40)x 1 x=2,(32) 6x 0.9=4.5 ,(41)x -

3、x=14,9(33) 2 (x 3) =5.8 ,(42)IKI(34) 1.6x=6.4(43)72 2. 4(35) 4x 3X 9=29,(44)1.2 :(36) 16+8x=40,(45)x 10,(37) x +1.1=3 ,(46)20=x： 0.8 ,5(38)+x=1(47 )(55 ) x： 0.3=至：J, 9 3(48 ) 1 - 25%X+25%x=+25%x)(56 ) 150%x+66=994(57 ) x+6- 0.8x=16xx- -=i 2(50 ) 425(58)34 ,一(51) 5 : 8=x: 32,(52 ) 2x+3X 0.9=24.9 ,3-x

4、 - 5依5. 5(59 )1(60 ) 3- (X-) =1.3105(53 )5.3x 2.9x=5(61) (X+0.5): = (X- 4):24(62 ) X +0.05=3.528 ,5(54 ),乂 ( 7- 2.8x ) =1.5 ,*(63 )2X 4 X 6=80,(72 )(64 )4X 4.5 3X=6.38 ,(73 )(65 )4X- 7.2=10 ,(74 )(66 )11.5X+X=20,(75 )0.25+2x上2 4(67 )3.8 X 12+15X=87.6 ,(68 )6X+5=17,(76 )(69 )0.6 X (2.5+X) =4.2 ,(77 )

5、200: 6=x：12(70 ):=X:3(78 )(71)10271:一 二(79 )8 (x-2) =2 (x+7),*-(80 ) JL： 18%息上, 20 X(88 ) 3 (x+4.5 ) =60,(89 ) 1.6x+2.4=7.52生 2x=1,(81) L 二(90 ) 3 (x 0.8 ) =6.3 ,-=x+x=46, (82 ) (91) 28.4 5x=5.8 ,(83 )1：x=2：殳 43 5(84(93 ) l+2x=l, 22(85 ) 5 (3x4) 2 (x1) =5 (2xT )(86 )(94 )20+ x=15%(95 )(87 ) 8 (2X 7)

6、 =5 (X+13),(104)(96) x+50%x=q(105)(97)三 x=0.3 : 12, 4(98) 4x+2 (8-x) =26,(106) 5x+35=650,(99) L-2=0,3 4(107) 720 + 3x=80,(100) *=1,5 5(108) 3.6x 0.9x=8.1 ,XX （罪）喑,(109) 4X4.5 3x=6,(110)(103) (1+1) x=28,(111) 6X3- 1.8X=7.2 ,(112 ) x=工, 1003(120) 22.5 - 0.4x=12.5 ,(113) x-5-=42,14(121) x： 3.5=4 : 21,(

7、114)-Lx+_=!,8 5 20(122 ) x - 0.8x 6=16,(115 ) 7x+3=8.19 ,(123)工 2=x： 8,(116 )(124 )0. 015 J0.06 2(117) 3 (x+2) =4 (x+1),(118)3x - 70%x=9.2,(126 )x24(119) 6+(127) x X 50%-x=5,(128 ) 1 -2x=4 5(136) 7x+3=8.19 ,(129 ) 2.5+1 4=3 3 T(137) 32.8 9x=17.5 ,(130) 3-2=4,62(138) x - 0.36x=16 ,(131) 8.5 - 3x=21,

8、2(139) 6 X 7+3x=69,(132 ) 3士+ x=4,6(140) 6x+2x- 56=0,(133 ) 2-5%=17.54,4(141) 3x 0.45 X 4=2.7 ,(142) 5.8x 4.6x=0.96 ,(143) 8.4+ (9 x) =3,(135) 6x+31=49*-(144) 3x +1.2=8,(153 ) 7.8 3x=3.6 ,(145) 5x+28=71,(154 )6 X3 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 )：.：

9、(148) 0.75x 0.95 X 4=8.5 ,(157 )X- 7.65=4.64 ,(149) 54+2+3x=72,(158 )28.25 - X=8.25 ,(150) 8x - 2.6=37.8 ,(159 )X- ( 3.6+2.97 ) =12.42 ,(151)(160)-x=3x38(152 ) x+30%x=26,(161)年14.5=5.5 , 8*(162 ) x 80%x=4日(163) 75%x- 5xW=6,5(172)二3lx=lx=可2(164 ) x-6.8=15.4 ,(173 ) 4.5 X_1 - 31x=1.5 , 3 2(165 ) 1.9x=

10、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) xX 20%=15.2,(168) x -1.5=12.9 ,(178 )一1x-5x=1013(169) 9x+5x=8.4(170) 6.8+3.2x=14.8(179 )75%=3*-(181)42, Lx=1: 4.5 ,(189 ) 4x 5X6=12,(180) 4x-|x14z2. 4,(188)y4216二1,(182 ) (x- 4.5 ) X 6=12.5 ,(190) 8x- 3x=15.6 ,(183)

11、 27- 17x=13.4 ,(191) 30X ( x+ 4) =60,(184) 9.6+3x=3.24 X 5,(192 ) 7.2 X 0.5 - 3x=1.2 ,(185) 2x+5=5x - 7,(193 ) 5x - 2.4 X 5=8,(186) 3(x 2) =2- 5 (x-2),(194 )x 2,(187) 4x- 3 (20 x) +4=0,(195) 5x+2.4 X 15=66,(196 3.2x+2.8x-x=1 ,(197 ) 2.5 X 16-8x=12 ,(198 ) 9.6-3x=6.3 ,(199) 5 (x+6) =75,(200) x + 0.7+

12、0.9 X 3=4,*(13) 0.6x+90%x=78,解方程专项练习200题答案:1 + ( x-l) X1=66x6x6x=46xx=(2) x X(9) 2x-x=1.2xx-21_LxX 21=21,217x=12;lx=1.2 ,5(3)- 4x=,46x=1-4x+4x=+4x,4 ra4x 一+ 4=4x + 412x=工48(4) 8 X 2.5 2x=13.620- 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+2

13、0%x0.4+20%x=10.4+20%x-0.4=1 0.4,20%x=0.620%x X -=0.6 X2020，x=3;(8)1+ (x-J) =6,3=1 ,=1.2=1.2 +二55(10) 9X 3 - 1.7x=13.4 ,27- 1.7x=13.4 ,27 - 1.7x+1.7x=13.4+1.7x13.4+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;*1x 0.6+0.6= +0.6 ,4

14、23 11-x=43y . S_ll . 3 x4 4 10 4*(x- 0.45 ) X (x-0.45 ) /(x-0.45), 3(18)1.5x=78,1.5x+1.5=78 + 1.5,x=52;(14) 20%x- 2.4 X 3=0.8 , 20%x- 7.2=0.8 ,20%x - 7.2+7.2=0.8+7.2 ,20%x+ 20%=& 20%x=40;(15)上x-x=42, 3 2.lx=42,_1x + _l=42 + -l,666x=252(16) 0.6x+3 X 2.5=67.5 , 0.6x+7.5=67.5,0.6x+7.5 7.5=67.5 7.5 ,0.6

15、x=60,0.6x+ 0.6=60 + 0.6 ,x=100;(17) 1 二+ (x - 0.45 )=工 53亚x-2.4=1.6 , 32.4+2.4=1.6+2.4 ,16 y:x=x= x- 2.25=8.25 ,2.25+2.25=8.25+2.25 ,x=10.5(20) /x+0.8=5.6 ,5Jx+0.8 - 0.8=5.6 - 0.8 ,52x=4.8 ,5Exx昱4.8 xE忸 3x=8.(21) 1.4 : x=1 : 0.75 , x=1.4 X 0.75 , x=1.05(22) x X (2-_l) =24,5xX 至=24,x x上+W=24+至，5 55x=

16、20;(23) 4x -圣我, q 44x-2巡=式巨4 fl 4 fl4x=4,4x + 4=4 + 4, x=1(24) 12x+7X 0.3=20.1 , 12x+2.1=20.1,12x+2.1- 2.1=20.1 -2.1,12x+12=18+12,x=1.510x=42X以，Tx=3(19)34,x=3: 12,10x +10=30+10,x=33x=予12, 43=9+ 3,(27) 2-X 0.5+-x=s-,2*0.75+.lx=3.75 ,20.75+lx - 0.75=3.75 - 0.75 ,2-lx=3,2x-=3- ,322x=6;x - 3+3=2.9+3x=5.

17、9(34) 1.6x=6.41.6x + 1.6=6.4x=4;1.6(28) 0.8 :旦0.48 : x,120.8x= JLx 0.48 ,120.8x=0.2,0.8x+0.8=0.2 +0.8 ,x=1x=4(29) x -= p55x=3(30) 42:j卜M=42 X 25 T*2I55 bx=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+0.96x=5.4,6x +6=5.4 +6,x=0.9;(33) 2 (x- 3) =5.8

18、 ,2 (x - 3) + 2=5.8 +2 x 3=2.9 ,(35) 4x - 3X 9=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- 1.1 X 1.1=3 X 1.1x=3.3(38)1+2x, 42+2x 1-12x=2xx=(39)72100+ 2,1.2X3 7x=1.04 ,2.16-7x=1.04 ,2.16 - 7x- 1.04=1.041.127x x=0.16-7x=0

19、,+ 7=1.12 +7,(40) x 1x=2,23x - 1=2,4-x- 1+1=2+1,lx-G 2-3fx=18;一、 2 (41) x- -x=14,91.04 ,，x=14, 9,1x =14 _：_x=18;(42) 3x -x=2,4 190.25x=0.75x=3x=1(48) 1 25%X+25%x=+25%K40.25x+0.25 0.25=1 0.25 ,9=18 . 92.4x=72 X 0.26 ,1.25= X(49) 0. 25 1. 6-0.25x=1.25 X 1.6,0.25x + 0.25=1.25 X 1.6 - 0.25 ,x=8(50) 4x x

20、+U x, 4 2 51 42.4x=18.72x=2.4x +2.4=18.72 +2.4 ,x=7.8(44) 1.2 :(51)8x=55 : 8=x： 32,X 32,4=1.2 X 5,8x+8=5X 32+ 8, x=20(52) 2x+3 X 0.9=24.9 ,4=6,315,x=11.1(53) 5.3x - 2.9x=$,旦=18空102.4x3X= x=10IS+ 2.4= + 2.4 ,x=10x=12;(46) -L 工x： 0.8 ,2。 5(54)3x(7 - 2.8x ) =1.5X ( 7-2.8x )7亨.52x+2.7=24.9,2x+2.7- 2.7=2

21、4.9 - 2.7 ,2x +2=22.2+2,2.4x=工=_Lx 0.8 5 207- 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=0.2(47) x 4-=-+1, 4 6x=1.75;(55) x： 0.3=:三 9 3x=0.3 x-,39x= _!_16(56) 150%x+66=991.5x+66=991.5x=33x=22(57) x+6- 0.8x=160.2x+6=160.2x=102X - 24+24=80+24,2X=104,2X +2=104+2, X=52;(6

22、4) 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=50x=14.4-k - 5髯x=5. E(59 ) -0.55x=5.5x=10(60 )3 + (X 10上）=1.33一+10X ( x-=1.3 x (x-),旦=1.3x -0.78 ,10Jl+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

23、, X=4.3;(66) 11.5X+X=20,12.5X=20,12.5X- 12.5=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=2.84.68=1.3x4.68+ 1.3=1.3x + 1.3 ,(68) 6X+5=17,6x+5-5=17-5,6x +6=12+6,x=2;x=3.62.25x(69) 0.6 X ( 2.5+X) =4.2 ,0.6 X (2.5+X)2.5+x=72.5+xx=4.52.25x-1

24、0+10=0.125+10 ,+ 2.25=10.125 +2.25 , x=4.5(70)三-=X:4 3+ 0.6=4.2 + 0.6 ,2.5=7 2.5 ,2X=3X x3 4 15(62) X+0.05=3.528 ,X+ 0.05 X 0.05=3.528 X 0.05 ,X=0.1764;x=0.6(63) 2X- 4X6=80,2X - 24=80,(71) 12 上乂2, 2K IS 45y=!, 6X 52Tio si 15x=(77) 200:6=x：(78)什6x=2006x +6=480+6, x=804-XX-X=4,5-X4十一5 55X=10丁 )5 14(79

25、) 8 (x-2) =2 (x+7),8X6X-16=2X+14,16=14,6X=30X=5(80)工18%旦旦 20 X-Ax=0.18X6.5 ,204x=4x=1X=1.17 ,2。,、413(75) -X 0.25+ -x=-,52 40.2+1x=20.2+1 x0.2=- 0.2 ,4X=7.8(81) 54 c c2x+2x_x=_2 20x=+2x-2(76)x-2x=*2x +2=上+ 2,10_x+2x=46,(82) E 4x (N+ m=46,骂二46,20星 x+&=46 %20 2020x=40;(83) : x=:,43 5x= 匚 18 (87) 8 (2X-

26、 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,(84) L ,二2 x1.6x=6.4 X2,1.6x=12.8,1.6x +1.6=12.8 + 1.6 , x=8(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

27、=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;(85) 5 (3x-4) - 2 (xT) =5 (2xT)15x-20-2x+2=10x-5,13x- 18=10x -5,13x- 18- 10x=10x -5- 10x,3x- 18=- 5,3x- 18+18=- 5+18,3x=13,3x+3=13 + 3,13x=3，(86) 二号833 (6x- 1) =64,18x- 3=64,18x- 3+3=64+3,18x=67,

28、18x +18=67+ 18,(91) 28.4 - 5x=5.8 ,28.4 - 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(92)x :25x=25x=225x + 25w + 25 ,x=J-.50(93) l+2x=1,22工2x.里-1,22 2 22x=0 ,x=0;(94) JL+x=15%,20二 x X x=15%x,20 0.15x=0.15,0.15x +0.15=0.15 +0.15, x=1;1100)上 Jx=1 ,5 5-J+x 5 52x=25 5

29、。=1 3x=1(101) xX (1国 3 5x=-, 1& 19,1911_x八与式xK, 1511 19 11xXx=(102) J-3K二4192叶-飙+3x制+3(96) x+50%x=q1.5x=63x1.5xx=4+ 1.5=6 + 1.5 ,x=(97) W x=0.3 : 12,40.3x=0.3x + 0.3=9 + 0.3 ,x=30(98) 4x+2 (8-x) =26, 4x+16- 2x=26,9哼28Xlx=202x+16=262x+162x-16=26- 16,+ 2=10+2,、21(104) x-刍二 1, 714x=51 q (99) -x-=0, 3 4

30、ZX= 1 X,/ 5 x14 5x=1(105) xX软一呵_ 9x=疝x=8522(106) 5x+35=650,*5x+35- 35=650- 35,x=912.5+0.4x=22.55x=615,5x +5=615+5, x=123;(107) 720+3x=80, 720 +3xX3x=80X 3x, 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+

31、3x=6+3x,6+3x=18,6+3x- 6=18-6,3x=12,3x +3=12+3, x=4(110)1 =工 *, x 0. 8 2.5x=10 X0.8,2.5x + 2.5=8 + 2.5 , x=3.2;(111) 6X3- 1.8X=7.2 ,18- 1.8X=7.2 ,(114)起x+_1J_2, 8 5 2C15X+1_1=19.Jx=8 5 5 20 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， 20.6x=12 xl,20.6x=6,0.6x

32、+ 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=218 T.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 ,(118)3x - 70%x=9.2,3x 0.7x=9.2 ,2.3x=9.22.3x+2.3=9.2 +2.3,X=6x=4(119) 6+ -|x=240,x=6+二 x 6=240 6, 5x=工10。x=234,5(113)

33、x +=42,14x=390x=42旦14(120) 22.5 - 0.4x=12.5 ,22.5- 0.4x+0.4x=12.5+0.4x*12.5+0.4x0.4x12.5=22.5 12.5 ,+ 0.4=10 + 0.4 ,x=30x=25-九+2瓦 x+x x,4 4 5 4(121) x： 3.5=4 : 2-1,J5+x=1,5 4-ix=3.5 X 4,32 lx- 21=14-33x=6(122) x - 0.8x 6=16,0.2x0.2x0.2x-6=16,-6+6=16+6,+ 0.2=22 +0.2 ,x=(123)Xx=110(129)殳152.5+1x=3,1 7

34、2.5+1 2x - 2.5=3三三xx37 &x=!, 3 14 3限3 八一 5 14 5x=4x=(124 )0.06(130)914志x- J=4,623x - 21+A=4+2i,62 220.06x=2 X 0.015,0.06x + 0.06=0.03 + 0.06 ,x=0.5一、.4(125) x： 15=二: 9x=工 x 6=15 x6-x 6,叟.23x=40(131) 8.53x=(126 )x=(127) xX50%- t-x=5,8.5 - 3x+3x=2+3x,23x+2-i=8.5 ,23x+23x=6,3x +3=6+3,x=2(132)成+ x=4,6x

35、X 6=5 X 6,目53 -xx x=4x x, 6*4x=34xx=+ 4=3 至+ 4,62324(133)型x-5%=17.54,解： 工一5%+5%=17.54+5%4X .2=17.59 . 工x=2375(134)解:2理二- 1 A.22f21 2 2x=31721(135) 6x+31=496x+31 -31=4931,6x=186x +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=17.5 ,32.8 - 9x+9x=17.5+9x ,

36、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, 8x=56,8x +8=56+8, x=7(141) 3x - 0.45 X 4=2.7 ,3x

37、- 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 + 1.2 X 1.2=8 X 1.2 , 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

38、;(146) 8.7 - 1.2x=3.9 , 8.7 - 1.2x+1.2x - 3.9=3.9+1.2x4.8=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 -0.95 X 4=8.5 , 0.75x 3.8=8.5 ,-3.9 ,*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

39、- 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=5.054.5x=8,4.5x +4.5=8 +4.5 ,x=(156)工9-l=x：S-x=x=S 154 I?-x X 4= 1 X 4,412x=(152) x+30%x=26,(1+30%) x=26,1.3x=26,1.3x +1.3=26 + 1.3x=20;(153) 7.8 - 3x=3.6 ,7.8 - 3x+3x=3.6+3x ,3.6+3x=7.8,3.6+3x

40、3.6=7.8 3.6 ,3x=4.2,3x +3=4.2 +3,x=1.4(154)6 X3T.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=10 X0.8,lx=lx3 40lxx ax=(157)1J, d8 40 815X- 7.65=4.64 ,X- 7.65+8.67=4.64+7.65 ,X=12.29(158) 28.25 - X=8.25 ,

41、28.25- X+X=8.25+X,X+8.25=28.25,X+8.25 8.25=28.25 8.25 ,X=20(159)(160)X- ( 3.6+2.97 ) =12.42 ,-6.57=12.42 ,-6.57+6.57=12.42+6.57 ,X=18.99- x-3x38x x,x=(161) W 14.5=5.5 ,14.5+14.5=5.5+14.5 ,=20,二 X 8=20X 8, 2x=160(162) x 80%x=4日*(173) 4.5 xl - x=1.5 , 3 21.5-3.5x=1.5 ,1.5- 3.5x+3.5x=1.5+3.5x,1.5=1.5+3

42、.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;(1 - 0.8 ) x=48, 0.2x=48,0.2x+ 0.2=48 + 0.2 ,x=240;(163) 75%x- 5xW=6,0.75x- 3=6,0.75x- 3+3=6+3,0.75x=9,0.75x+ 0.75=9 + 0.75 ,x=12 (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;(166) 4.3y - y=4.6 ,3.3y=4.6, 3.3y +3.3=4.6 +3.3