[(x+0.4)/0.2]-[(x-3)/0.5]=-1.6
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x/0.5-0.4x-0.6/0.2=2(-x+3)
0.5x+3(0.3-0.2x)≥0.4x
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
0.02x-0.01/0.03-0.4x+0.2/0.5-3X+2/4=-3求x
2-(1-x)=-3、3(x-3)=2x-1,0.4x-3(20-0.2x)=3,
解方程:2- x+5/6=x- x-1/3,0.1-0.2x/0.03-1=0.7-x/0.4
0.2x+0.4x=12 x=?20x+x=420 x=?
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解方程1.5x＝0.14-1.3x x-0.2＝0.25x+2.8 3x+0.4＝0.04解方程1.5x＝0.14-1.3xx-0.2＝0.25x+2.83x+0.4＝0.04+7x
x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)
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0.2*（3X-5)+3=0.4*(X-2)+4
0.4x-3(20-0.2X)=3
0.2分之x+0.4-0.5分之x-3=2?
0.2分之x+3-0.4x-1=-2.5
3x/0.5-(7*0.2-x)/0.4=1急用!
0.2分之0.1x+3-0.4x-1=20