x/90-x/(90*1.2)=80/60

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x/90-x/(90*1.2)=80/60
x/90-x/(90*1.2)=80/60

x/90-x/(90*1.2)=80/60
两边同乘(90*1.2)得
1.2x-x=80*1.8
0.2x=144
x=72

80X-90X=6x+80X 解是几 90/(x/10)*x/6+90=x怎么解解方程6x+3x=90+4x (X+80)/90=(X-80)/60 x*x-x=90怎么解 90-x=2x(18+x) 0.8x+1.2(90-x)=88 80+90%x=x怎么算 90%x-70%x=25×80% x/90-x/(90*1.2)=80/60 7(X+6)-3X=90 x+2x+（x+10）=90,x=? 90-x=50+x x-70%x=90 x-25%x=90 X(X-1)=90 X/(X+40)=90% X/(X+40)=90%