(x-20)*(0.2-0.15)=0.5x+5

0.5x+0.15x+(20-2x)*0.2=5.5 x=? 0.2x+0.4x=12 x=?20x+x=420 x=? (x-20)*(0.2-0.15)=0.5x+5 0.15x+0.2×(66-x)=[5x+9×(66-x)]×0.18 解x 急 x-(0.15x+20)+370=1.2x 怎么解 0.2(0.2-x)/0.01+1.2x=0.12+20x (1+0.2)X=(X-64)/0. 60x=(60+20)(x-0.15) X-0.15X=? (1)2(2-x)-3=-(x-1)(2)12(3-2x)-3=9(3-2x)(3)(1-x)/6-(x-2)/3=0(4)x/3=(x+2)/2-1(5)(2-x)/3=(x-2)/4-1(6)5x/12=(2x-1)/4-1(7)(x-3)/0.15-(x+4)/0.2=1.6(8)(40-x)*20％=40*12.5％ 21分之10x÷3分之2=7分之3x-3分之1x-2分之1x=190x-53x=7408.5x-6.9x=43.3x-200=0.2x+1101.02+0.4x+2.6x=3.428.9x-67=4.5x+656x-58=3x+1410x-20=5x+806x+5=10x-3420-1.4x=9.8x-288.2x+5.4x=272 18%x+32%x=2 x+20%x=2.4 x+5%x=4.2 15%x+35%x=0.2 x+3/20x=46 ,x-1/5x=40 ,x-1/2x=3/4 ,x-0.2x=18解方程 一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X X^2-X-20=0.X的平方减X减二十等于零. (X+4)/0.2-(X-3)/0.5=0.2 x-(x-1)/6=3-(x+2)/3 x/12-(2x-1)/20={(3x+4)/8}-1 2%x-5+5%x=20%0.13(x-1)=0.07(x+1) x/2-x/6+x/8-x/10=1-1/3+1/4-1/5 数学题,一元一次方程. x-4=2-5x 4x-3（20-x)=5x-7(20-x) 1-2x-5/6=3-x/4 x/0.3-0.17-0.2x/0.02=1 2-(1-x)=-3、3(x-3)=2x-1,0.4x-3(20-0.2x)=3,