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1、.小数方程专项练习(有答案)(1)(x+0.55)4=3.6(8)6x8.54=20(2)2x8=0.8(3)1.52+2x=5(4)4.7x=1.9x+7(5)12.6(x+4.8)2=63(6)12.5+4x=21.7(7)13.5x8.5x=20.下载可编辑.9)36x=0.410)9.6xx=4311)3x40.9=46.212)3.5x47=4213)x0.9x=81.914)3.8+5x=12.3(.(15)4(0.3+x)=6.8(23)2.5x20=16(16)8x1.6x=19.2(24)6.2xx=41.6(17)x1.8=1.62(18)22.52+5x=135,(19)
2、1.4x+9.8=22.4,(20)2(x3)=11.6,(21)684.4x=24,(22)1.685x=2.3.下载可编辑.25)x0.5=48.6226)5X7.8=20.2,27)2.5XX=1.8,28)(4.5+X)2=13,29)7x29=80,30)13x7.5x=18.7,(.(31)(x+12)6=108,(39)2x2.510=15(32)4x+30.7=6.5(40)3.85+1.5x=6.1(33)2(x0.5)=1.6(34)3x2.34=4.914(35)1.44x=0.4(36)2x+6=12.5(37)2.5xx=1.2(38)(4.5+x)2=63.下载可编
3、辑.41)13(x+2.5)=16942)2x2+1.8=3.643)7(x1.2)=3.5744)2+1.82x=3.645)7x0.3=4.246)6x+4x11=32.9(.(47)7(x1.2)=2.87(55)3x+7=29.5(48)2.4+3.4x=5.8(56)5x2.81.2=1.04(49)5(x1.2)=35(50)2.5x+51=178(51)2.4x+1.6x=2.2(52)8(x6.2)=41.6(53)0.5(x0.5)=7.5(54)(9x+1.5+7x)5=5.1.下载可编辑.57)4x+6x=28.558)2.38x+9.8=33.659)2(x3)=10.
4、660)13xx=14.461)681.1x=2462)3(x+3.5)=21.6(.(63)3x54=136.5(71)7x0.7=1.3,(64)x0.36x=3.2(72)(5.9+x)3+16=30,(65)4x+2.84=19.32(66)4x5.2=5.2(67)4.8x+2.6x=3.7(68)3x+6.42=50.3(69)2.7x1.8=1.2x+2.7,(70)85(6x+0.7)=10 x+0.5,.下载可编辑.73)0.5654x=0.4,74)4(x0.5)=9.6,75)2(x+1.7)=9.276)8x4x=0.6477)2x0.24=0.1278)(3.82)x
5、=14.4(.(79)6416X=56.8(85)3(5.4+X)6=7.2,(80)8.6X2.6X=36.6(82)640.6X=6.36(83)0.031505x=3.2(84)45.34X=35.7,.下载可编辑.86)5.9X+7=8.7X,87)3+0.6x=4.3288)0.6(y0.4)=6,(.小数方程小数方程 8888 题参考答案:题参考答案:(1)(x+0.55)4=3.6(x+0.5)44=3.64 x+0.5=0.9 x+0.50.5=0.90.5 x=0.4(2)2x8=0.82x84=0.84 x=3.2(3)1.52+2x=5 3+2x=5 3+2x3=532x
6、2=22 x=1(4)4.7x=1.9x+74.7x1.9x=1.9x1.9x+7 2.8x=72.8x2.8=72.8 x=2.5(5)12.6(x+4.8)2=636.3(x+4.8)=636.3(x+4.8)6.3=636.3 x+4.8=10 x+4.84.8=104.8 x=5.2;(6)12.5+4x=21.7 12.5+4x12.5=21.712.54x4=9.24 x=2.3(7)13.5x8.5x=205x5=205 x=4(8)6x8.54=20 6x34=20 6x34+34=20+346x6=546 x=9(9)36x=0.436xx=0.4x36=0.4x.下载可编辑
7、.360.4=0.4x0.4 x=90;(10)9.6xx=43(9.61)x=438.6x8.6=438.5 x=5;(11)3x40.9=46.2 3x3.6=46.2 3x3.6+3.6=46.2+3.63x3=49.83 x=16.6(12)3.5x47=42 3.5x28=42 3.5x28+28=42+28 3.5x=703.5x3.5=703.5 x=20;(13)x0.9x=81.9 0.1x=81.90.1x0.1=81.90.1 x=819;(14)3.8+5x=12.3 3.8+5x3.8=12.33.8 5x=8.55x5=8.55 x=1.7;(15)4(0.3+x)
8、=6.8 4(0.3+x)4=6.84 0.3+x=1.7 0.3+x0.3=1.70.3 x=1.4(16)8x1.6x=19.2 6.4x=19.2,6.4x6.4=19.26.4,x=3;(17)x1.8=1.62x1.81.8=1.621.8,x=2.916;(18)22.52+5x=135,.45+5x45=13545,5x5=905,x=18(19)1.4x+9.8=22.4,1.4x+9.89.8=22.49.8,1.4x=12.6,1.4x1.4=12.61.4,x=9;(20)2(x3)=11.6,1.5x1.5=1.81.5,x=1.2;(28)(4.5+X)2=13,(4
9、.5+x)22=132,4.5+x4.5=6.54.5,x=2(29)7x29=80,7x18=80,7x18+18=80+18,7x=98,2x6=11.6,2x6+6=11.6+6,2x=17.6,2x2=17.62,x=8.8;(21)684.4x=24,684.4x+4.4x=24+4.4x,24+4.4x=68,24+4.4x24=6824,4.4x=44,4.4x4.4=444.4,x=10(22)1.685x=2.3 12.85x+5x=2.3+5x 2.3+5x2.3=12.82.35x5=10.55 x=2.1;(23)2.5x20=162.5x2020=16202.5x2.
10、5=3202.5 x=128;(24)6.2xx=41.6 5.2x=41.65.2x5.2=41.65.2 x=8;(25)x0.5=48.62x0.5=97.2x0.50.5=97.20.5 x=48.6(26)5X7.8=20.2,5x7.8+7.8=20.2+7.8,5x5=285,x=5.6;(27)2.5XX=1.8,.下载可编辑.7x7=987,;30)13x7.5x=18.7,(137.5)x=18.7,5.5x5.5=18.75.5,;31)(x+12)6=108,(x+12)66=1086,12=1812,32)4x+30.7=6.52.1=6.52.1x4=4.4433)
11、2(x0.5)=1.61=1.61+1=1.6+12x2=2.6234)3x2.34=4.9147.02x7.02=4.9147.0235)1.44x=0.41.44xx=0.4x x=14(5.5x=18.7 x=3.4(x+12=18 x+12 x=6(4x+2.1=6.5 4x+2.1 4x=4.4 4 x=1.1(2x 2x 2x=2.6 x=1.3(7.02x=4.914 x=0.7(0.4x=1.44.0.4x0.4=1.440.4 x=3.6(36)2x+6=12.5 2x+66=12.562x2=6.52 x=3.25;(37)2.5xx=1.2 1.5x=1.21.5x1.5
12、=1.21.5 3.83.6=3.6+2x3.60.22=2x2 x=0.1;(45)7x0.3=4.27x0.30.3=4.20.37x7=1.267 x=0.18;(46)6x+4x11=32.9 x=0.8;(38)(4.5+x)2=63(4.5+x)22=632 4.5+x4.5=31.54.5 x=27;(39)2x2.510=15 2x25+25=15+252x2=402 x=20(40)3.85+1.5x=6.1 3.85+1.5x=6.13.853.85+1.5x=6.13.85 1.5x=2.251.5x1.5=2.251.5 x=1.5(41)13(x+2.5)=169 1
13、3(x+2.5)13=16913 x+2.5=13 x+2.52.5=132.5 x=11.5(42)2x2+1.8=3.6 2x0.2=3.6 2x+0.20.2=3.6+0.2 2x=3.82x2=3.82 x=1.9(43)7(x1.2)=3.577(x1.2)7=3.577 x1.2=0.51 x+1.21.2=1.2+0.51 x=1.71(44)2+1.82x=3.6 3.82x+2x=3.6+2x.下载可编辑.11+11=32.9+1110 x10=43.910;47)7(x1.2)=2.87(x1.2)7=2.8771.2+1.2=0.41+1.248)2.4+3.4x=5.8
14、2.4=5.82.43.4x3.4=3.43.4;49)5(x1.2)=35(x1.2)5=3551.2=71.2+1.2=7+1.2;50)2.5x+51=17851=136512.5x2.5=852.551)2.4x+1.6x=2.24x4=2.24;52)8(x6.2)=41.6(x6.2)8=41.686.2+6.2=5.2+6.2 10 x x=4.39(7 x x=1.61(2.4+3.4x 3.4x=3.4 x=1(5 x x x=8.2(2.5x+51=136 2.5x+51 2.5x=85 x=34(4x=2.2 x=0.55(8 x x=11.4.(53)0.5(x0.5)
15、=7.50.5(x0.5)0.5=7.50.5 x0.5=15 x0.5+0.5=15+0.5 x=15.5;(54)(9x+1.5+7x)5=5.1(16x+1.5)5=5.1(16x+1.5)55=5.15 16x+1.5=25.5441.1=1.1x1.1 x=40(62)3(x+3.5)=21.6 3(x+3.5)3=21.63 x+3.53.5=7.23.5 x=3.7;(63)3x54=136.5 3x54+54=136.5+54 16x+1.51.5=25.51.5 16x=2416x16=2416 x=1.5;(55)3x+7=29.5 3x+77=29.57 3x=22.53
16、x3=22.53 x=7.5(56)5x2.81.2=1.04 5x3.36=1.04 5x3.36+3.36=1.04+3.36 5x=4.45x5=4.45 x=0.88(57)4x+6x=28.5 10 x=28.810 x10=28.510 x=2.85(58)2.38x+9.8=33.6 2.38x+9.89.8=33.69.8 2.38x2.38=23.82.38 x=10(59)2(x3)=10.6 2(x3)2=10.62 x3+3=5.3+3 x=8.3;(60)13xx=14.4 12x=14.412x12=14.412 x=1.2;(61)681.1x=24681.1x+
17、1.1x=24+1.1x 6824=24+1.1x24.下载可编辑.3x3=190.53;64)x0.36x=3.20.64x0.64=3.20.64;65)4x+2.84=19.3211.2=19.3211.24x4=8.12466)4x5.2=5.25.2+5.2=5.2+5.24x4=10.44;67)4.8x+2.6x=3.77.4x7.4=3.77.4;68)3x+6.42=50.312.8=50.312.83x3=37.5369)2.7x1.8=1.2x+2.7,1.8+1.8=1.2x+2.7+1.8,1.2x=1.2x+4.51.2x,1.5x1.5=4.51.5,;70)85
18、(6x+0.7)=10 x+0.5,x=63.5(0.64x=3.2 x=5(4x+11.2 x=2.03(4x 4x=10.4 x=2.6(7.4x=3.7 x=0.5(3x+12.8=50.3 3x+12.8 3x=37.5 x=12.5(2.7x 2.7x x=3(.830 x3.5=10 x+0.5,4.530 x+30 x=10 x+0.5+30 x,4.50.5=40 x0.5,440=40 x40,x=0.1;(71)7x0.7=1.3,7x0.7+0.7=1.3+0.7,7xx=2x,72=2x2,x=3.5;(72)(5.9+x)3+16=30,(5.9+x)3+1616=3
19、016,(5.9+x)33=143,5.9+x5.9=425.9,x=36.1(73)0.5654x=0.4,2.84x=0.4,2.84x+4x=0.4+4x,0.4+4x=2.8,0.4+4x0.4=2.80.4,4x=2.4,4x4=2.44,x=0.6;(74)4(x0.5)=9.6,4x2=9.6,4x2+2=9.6+2,4x=11.6,4x4=11.64,x=2.9(75)2(x+1.7)=9.22(x+1.7)2=9.22 x+1.7=4.6 x+1.71.7=4.61.7 x=2.9(76)8x4x=0.64 4x=0.644x4=0.644 x=0.16(77)2x0.24=
20、0.122x0.24+0.24=0.12+0.24 2x=0.36.下载可编辑.2x2=0.362 x=0.18(78)(3.82)x=14.4 1.8x=14.41.8x1.8=14.41.8 x=8(79)6416X=56.8 6416X+16X=56.8+16X 16X+56.8=64 16X+56.856.8=6456.8 16X=7.216X16=7.216 X=0.45;(80)8.6X2.6X=36.6 6X=36.66X6=36.66 X=6.1;(81)2.2(X+8)=222.2(X+8)2.2=222.2 X+8=10 X+88=108 X=2;(82)640.6X=6.
21、36 240.6X=6.36 240.6X+0.6X=6.36+0.6X 0.6X+6.36=240.6X+6.366.36=246.36 0.6X=17.640.6X0.6=17.640.6 X=29.4(83)0.031505x=3.2 4.55x=3.2,4.55x+5x=3.2+5x,4.53.2=3.2+5x3.2,1.35=5x5,x=0.26;(84)45.34X=35.7,45.34X+4X=35.7+4X,35.7+4X=45.3,35.7+4X35.7=45.335.7,4X=9.6,.4X4=9.64,X=2.4;(85)3(5.4+X)6=7.2,(35.4+3X)66=7.26,16.2+3X=43.2,16.2+3X16.2=43.216.2,3X=27,3X3=273,X=9;(86)5.9X+7=8.7X,5.9X+77=8.7X7,5.9X=8.7X7,5.9X5.9X=8.7X75.9X,2.8X7=0,2.8X7+7=0+7,2.8X=7,2.8X2.8=72.8,X=2.5(87)3+0.6x=4.32 3+0.6x3=4.323,0.6x0.6=1.320.6,x=2.2;(88)0.6(y0.4)=6,0.6(y0.4)0.6=60.6,y0.4+0.4=10+0.4,y=10.4.下载可编辑.
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