20/x=20/(x+2.5)+0.4
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20/x=20/(x+2.5)+0.420/x=20/(x+2.5)+0.420/x=20/(x+2.5)+0.4两边同乘x*(x+0.5)化简的0.4x*x+x-50=0,所以x=10或-12.5
20/x=20/(x+2.5)+0.4
20/x=20/(x+2.5)+0.4
20/x=20/(x+2.5)+0.4
两边同乘x*(x+0.5)化简的0.4x*x+x-50=0,所以x=10或-12.5
20/x=20/(x+2.5)+0.4
0.2x+0.4x=12 x=?20x+x=420 x=?
2x:16-2x=2.5x:20-2.5x x=爱克斯（未知数）
x-20%x=45+20%x
x+x²=20,x=?
x - 15%x+20%x=23.
x-0.3x-0.5x=20
0.88（X+20%X)=X+84
X-30%X+8-X=20
x*x*(1/4)=20x
x(x-20)=x+10
30%x=50%x-20x
10+x=2.5x-20
10+x=2.5x-20
2.5%X+(20-X)*2.25%=0.485
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
20%x+20%x×30%x-20%x=4.5
(x+20)+x=60+x-(x+20)