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1、小数方程专项练习（有答案）(8) 6x- 8.5 >4=20(1) (x+0.55 ) >4=3.6(9) 36畝=0.4(2) 2x 充=0.8(3) 1.5 >2+2x=5(4) 4.7x=1.9x+7(10) 9.6x - x=43(11) 3x - 4X0.9=46.2(12) 3.5x - 4>7=42(5) 12.6 (x+4.8 )吃=63(6) 12.5+4x=21.7(13) x- 0.9x=81.9(7) 13.5x - 8.5x=20(14) 3.8+5x=12.3(15) 4 ( 0.3+x ) =6.8(23)2.5x 吃0=16(16) 8x
2、 - 1.6x=19.2(24)6.2x - x=41.6(17) xT8=1.62(25)x0.5=48.6 X2(18) 22.5 X2+5x=135,(26)5X- 7.8=20.2 ,(19) 1.4x+9.8=22.4(27)2.5X - X=1.8 ,(20) 2 ( x- 3) =11.6 ,(28)(4.5+X) >2=13,(21) 68 - 4.4x=24 ,(29)7x - 2>9=80,(22) 1.6 >8 - 5x=2.3(30)13x - 7.5x=18.7 ,(39) 2x - 2.5 >0=15(31) (x+12) >6=108
3、,(38) (4.5+x ) >2=63(46) 6x+4x - 1仁32.9(32) 4x+3».7=6.5(40) 3.85+1.5x=6.1(41) 13 (x+2.5 ) =169(33) 2> (x - 0.5 ) =1.6(34) 3x >2.34=4.914(42) 2x - 2+1.8=3.6(35) 1.44 *0.4(43) 7 (x - 1.2 ) =3.57(36) 2x+6=12.5(44) 2+1.8 - 2x=3.6(37) 2.5x - x=1.2(45) 7x 七.3=4.2(55) 3x+7=29.5(47) 7 (x 1.2 )
4、 =2.87(54) (9x+1.5+7x )为=5.1(62) 3 (x+3.5 ) =21.6(48) 2.4+3.4x=5.8(56) 5x 2.8 >.2=1.04(57) 4x+6x=28.5(49) 5 (x 1.2 ) =35(50) 2.5x+51=17 >8(58) 2.38x+9.8=33.6(51) 2.4x+1.6x=2.2(59) 2 (x 3) =10.6(60) 13x x=14.4(61) 68 1.1x=24(52) 8 (x 6.2 ) =41.6(53) 0.5 (x 0.5 ) =7.5(63) 3x - 54=136.5(71) 7畝-0.
5、7=1.3 ,(64) x- 0.36x=3.2(72) (5.9+x ) £+16=30,(65) 4x+2.8 >4=19.32(73) 0.56 >5 - 4x=0.4 ,(66) 4x - 5.2=5.2(74) 4 (x - 0.5 ) =9.6 ,(67) 4.8x+2.6x=3.7(75) 2X (x+1.7 ) =9.2(76) 8x - 4x=0.64(77) 2x - 0.24=0.12(68) 3x+6.4 >2=50.3(69) 2.7x - 1.8=1.2x+2.7(79) 64 - 16X=56.8(85)3 ( 5.4+X)书=7.2
6、,(80)8.6X - 2.6X=36.6(86)5.9X+7=8.7X ,(82)6>4 - 0.6X=6.36(87)3+0.6x=4.32(83)0.03 >50 - 5x=3.2(88)0.6 (y - 0.4 ) =6,(84) 45.3 - 4X=35.7 ,coCDgeLuxg+於 9CXICXI(8L) f 9L6CXIUX °Qlxcxl9u85<8TXCXI9U°Q采 x 0)- OHX 寸* 2.6 Lu寸申 x寸.9 CXI.6UX 寸.9CXI.6UX9LX8 (9L)寸uxI 卜ueo x+eo卜ux+eo¥°
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10、x- 45=135- 45,5x为=90 -5,x=18(19) 1.4x+9.8=22.4 ,1.4x+9.8 9.8=22.4 9.8 ,1.4x=12.6,1.4x5.4=12.6 5.4 ,x=9;(20) 2 ( x 3) =11.6 ,2x 6=11.6 ,2x 6+6=11.6+6 ,2x=17.6,2x5!=17.6 5.,x=8.8;(21) 68 4.4x=24 ,68 4.4x+4.4x=24+4.4x,24+4.4x=68,24+4.4x 24=68 24,4.4x=44,4.4x 5k4=44 5k4 ,x=10(22) 1.6 対5x=2.312.8 5x+5x=2
11、.3+5x2.3+5x 2.3=12.8 2.35x 为=10.5 为x=2.1;(23) 2.5x 5!0=162.5x 5!0 >20=16X202.5x吃.5=320 5.5x=128;(24) 6.2x x=41.65.2x=41.65.2x 为.2=41.6 5i.2x=8;(25) x5).5=48.6 Xx5).5=97.2x 5).5 >0.5=97.2 X.5x=48.6(26) 5X 7.8=20.2 ,5x 7.8+7.8=20.2+7.8,5x5i=285i,x=5.6;(27) 2.5X X=1.8 ,1.5x 5.5=1.8 5.5 ,x=1.2;(28
12、) (4.5+X ) >2=13,(4.5+x ) >2-2=132,4.5+x 4.5=6.5 4.5 ,x=2.(29) 7x 2>9=80,7x 18=80,7x 18+18=80+18,7x=98,7x£=985x=14;(30) 13x 7.5x=18.7 ,(13 7.5 ) x=18.7 ,5.5x=18.7,5.5x55.5=18.7 5i.5 ,x=3.4;(31) (x+12) >6=108,(x+12) X七=10855, x+12=18,x+12 12=18 12 ,x=6.(32) 4x+3 >0.7=6.54x+2.1=6.5
13、4x+2.1 2.1=6.5 2.14x=4.44x韶=4.4 5x=1.1(33) 2X (x 0.5 ) =1.62x 1=1.62x 1+1=1.6+12x=2.62x吃=2.6 5.x=1.3(34) 3x >2.34=4.9147.02x=4.9147.02x £.02=4.914 502x=0.7(35) 1.44 5(=0.41.44 5 >x=0.4 >0.4x=1.440.4x 七.4=1.44 弋.4x=3.6(36) 2x+6=12.52x+6- 6=12.5 - 62x吃=6.5吃x=3.25;(37) 2.5x - x=1.21.5x=1.
14、21.5x £.5=1.2 -1.5x=0.8;(38) (4.5+x ) >2=63(4.5+x ) >2 吃=63 吃4.5+x- 4.5=31.5 - 4.5x=27;(39) 2x - 2.5 >0=152x - 25+25=15+252x吃=40吃x=20(40) 3.85+1.5x=6.13.85+1.5x=6.13.85 - 3.85+1.5x=6.1- 3.851.5x=2.251.5x 出.5=2.25 1.5x=1.5(41) 13 (x+2.5 ) =16913(x+2.5 ) 13=16913x+2.5=13x+2.5- 2.5=13 - 2
15、.5x=11.5(42) 2x - 2+1.8=3.62x- 0.2=3.62x+0.2- 0.2=3.6+0.22x=3.82x 吃=3.8 -2x=1.9(43) 7 ( x- 1.2 ) =3.577 (x - 1.2 ) £=3.57 2x- 1.2=0.51x+1.2- 1.2=1.2+0.51x=1.71(44) 2+1.8 - 2x=3.63.8 - 2x+2x=3.6+2x3.8 3.6=3.6+2x 3.60.2吃=2x吃x=0.1;(45) 7x 2).3=4.27x 2).3 >.3=4.2 ».37x £=1.26 2x=0.18;(
16、46) 6x+4x - 11=32.910x- 11+11=32.9+1110x20=43.9 20x=4.39;(47) 7 (x - 1.2 ) =2.877 (x- 1.2 ) £=2.87 2x - 1.2+1.2=0.41+1.2 x=1.61(48) 2.4+3.4x=5.82.4+3.4x- 2.4=5.8 - 2.43.4x=3.43.4x£.4=3.4 £.4x=1；(49) 5 (x - 1.2 ) =355(x- 1.2 )为=35弋x - 1.2=7x - 1.2+1.2=7+1.2x=8.2;(50) 2.5x+51=17 >82.
17、5x+51=1362.5x+51- 51=136 - 512.5x=852.5x 吃.5=85 吃.5x=34.(51) 2.4x+1.6x=2.24x=2.24x-24=2.2 2x=0.55;(52) 8 (x - 6.2 ) =41.68 (x- 6.2 ) £=41.6 2x - 6.2+6.2=5.2+6.2x=11.4.(53) 0.5 (x 0.5 ) =7.50.5 (x 0.5 ) 电5=7.5 弋.5x - 0.5=15x - 0.5+0.5=15+0.5 x=15.5;(54) ( 9x+1.5+7x )为=5.1(16X+1.5 )弋=5.1(16x+1.5
18、)弋X5=5.1 >516x+1.5=25.516x+1.5 1.5=25.5 1.516x=2416x 岀6=2416x=1.5;(55) 3x+7=29.53x+7 7=29.5 73x=22.53x七=22.5 七x=7.5(56) 5x 2.8 >.2=1.045x 3.36=1.045x 3.36+3.36=1.04+3.365x=4.45x为=4.4弋x=0.88(57) 4x+6x=28.510x=28.810x £0=28.5 TOx=2.85(58) 2.38x+9.8=33.62.38x+9.8 9.8=33.6 9.82.38x吃.38=23.8 吃
19、.38x=10(59) 2 ( x 3) =10.62(x 3)吃=10.6 吃x 3+3=5.3+3x=8.3;(60) 13x x=14.412x=14.412x -12=14.4 -12x=1.2;(61) 68 1.1x=2468 1.1x+1.1x=24+1.1x68 24=24+1.1x 2444 T.1=1.1x T.1x=40.(62) 3 (x+3.5 ) =21.63(x+3.5 )七=21.6 七x+3.5 3.5=7.2 3.5x=3.7;(63) 3x 54=136.53x 54+54=136.5+543x£=190.5 -=3x=63.5;(64) x 0
20、.36x=3.20.64x=3.20.64x -).64=3.2 -).64x=5;(65) 4x+2.8 >4=19.324x+11.2 11.2=19.32 11.24x-4=8.12 韶x=2.03.(66) 4x 5.2=5.24x 5.2+5.2=5.2+5.24x=10.44x-4=10.4 -4x=2.6;(67) 4.8x+2.6x=3.77.4x=3.77.4x£.4=3.7 £.4x=0.5;(68) 3x+6.4 >2=50.33x+12.8=50.33x+12.8 12.8=50.3 12.83x=37.53x 七=37.5 七x=12.
21、5.(69) 2.7x 1.8=1.2x+2.7 ,2.7x 1.8+1.8=1.2x+2.7+1.8,2.7x 1.2x=1.2x+4.5 1.2x ,1.5x-.5=4.5 -.5 ,x=3;(70) 8 5 (6x+0.7 ) =10x+0.5 ,8 30x 3.5=10x+0.5 ,4.5- 30x+30x=10x+0.5+30x ,4.5- 0.5=40x - 0.5 ,4-40=40x40,x=0.1;(71) 7熬-0.7=1.3 ,7 訣-0.7+0.7=1.3+0.7,7畝 *=2 >x,7 吃=2x吃，x=3.5;(72) (5.9+x ) £+16=30,
22、(5.9+x )七+16 - 16=30 - 16,(5.9+x )七 >=14X3,5.9+x- 5.9=42 - 5.9 ,x=36.1(73) 0.56 X5 - 4x=0.4 ,2.8- 4x=0.4 ,2.8- 4x+4x=0.4+4x ,0.4+4x=2.8,0.4+4x- 0.4=2.8 - 0.4 ,4x=2.4,4x 韶=2.4 呜,x=0.62x吃=0.36 吃x=0.18(78) ( 3.8 - 2) x=14.41.8x=14.41.8x-1.8=14.4 T8x=8.(79) 64 - 16X=56.864- 16X+16X=56.8+16X16X+56.8=6
23、416X+56.8 - 56.8=64 - 56.816X=7.216X-16=7.2 勻6X=0.45;(80) 8.6X - 2.6X=36.66X=36.66X 书=36.6 书X=6.1;(81) 2.2 (X+8) =222.2(X+8)吃.2=22 吃.2X+8=10X+8- 8=10 - 8X=2;(74) 4 ( x- 0.5 ) =9.6 ,4x- 2=9.6 ,4x - 2+2=9.6+2 ,4x=11.6,4x韶=11.6 韶,x=2.9.(75) 2X (x+1.7 ) =9.22 X (x+1.7 )吃=9.2 吃 x+1.7=4.6x+1.7- 1.7=4.6 -
24、1.7x=2.9.(76) 8x - 4x=0.644x=0.644x韶=0.64 韶x=0.16.(77) 2x - 0.24=0.122x - 0.24+0.24=0.12+0.242x=0.36(82) 6X4- 0.6X=6.3624- 0.6X=6.3624 - 0.6X+0.6X=6.36+0.6X0.6X+6.36=240.6X+6.36 - 6.36=24 - 6.360.6X=17.640.6X弋.6=17.64 弋.6X=29.4(83) 0.03 X50 - 5x=3.24.5- 5x=3.2 ,4.5- 5x+5x=3.2+5x ,4.5- 3.2=3.2+5x -1.
25、3_e5=5x 5 ,x=0.26(84) 45.3 - 4X=35.7 ,45.3- 4X+4X=35.7+4X,35.7+4X=45.3,35.7+4X - 35.7=45.3 - 35.7 ,4X=9.6,3.2 ,4X韶=9.6 -4,X=2.4;(85) 3 ( 5.4+X) -6=7.2 ,(3X5.4+3X)吒><6=7.2 >6,16.2+3X=43.2,16.2+3X- 16.2=43.2 - 16.2 ,3X=27,3X-3=273,X=9;(86) 5.9X+7=8.7X ,5.9X+7 - 7=8.7X - 7,5.9X=8.7X- 7,5.9X - 5.9X=8.7X - 7 - 5.9X ,2.8X- 7=0,2.8X - 7+7=0+7,2.8X=7,2.8X -.8=7 吃.8 ,X=2.5(87) 3+0.6x=4.323+0.6x- 3=4.32 - 3,0.6x).6=1.32 ).6 ,x=2.2;(88) 0.6 (y- 0.4 ) =6,0.6 (y - 0.4 ) ).6=6 ).6 ,y - 0.4+0.4=10+0.4 ,y=10.4