(0.2-x)/0.4=1-0.3x/0.2
(1)3x(x+0.2)=4x(x-1.1)
0.2x+0.4x=12 x=?20x+x=420 x=?
(0.2-x)/0.4=1-0.3x/2
0.2分之0.1x+0.3+2.5=0.4x-1
3(x-7)-5(4-x)=15 0.2分之0.1x+0.3+2.5=0.4x-1
1-0.5x/0.3-2/3x=0.3x/0.2x+1
解方程:1+0.4x=0.2(x+10) 2.x÷2=x+200
2-(1-x)=-3、3(x-3)=2x-1,0.4x-3(20-0.2x)=3,
3x-2(4x+8)=2.4 6.5-(x+1.3)=2.2 0.2(x-4)=0.3(x-1
解方程:2- x+5/6=x- x-1/3,0.1-0.2x/0.03-1=0.7-x/0.4
解方程 1、x+5分之x+2=1.6+2分之x-1 2、0.3分之0.4(x-3)-0.04分之0.1x-0.2=1-2
化简(2x-5)(3x+2)-6(x+1)(x-2),其中x=0.2