1+15%分之x减去1-10%=500 x-y=950
问题描述:
1+15%分之x减去1-10%=500 x-y=950
答
是不是x/(1+15%)-y/(1-10%)=500?
x/1.15-y/0.9=500
x=y+950
(y+950)/1.15-y/0.9=500
y/1.15+950/1.15-y/0.9=500
y*(1/0.9-1/1.15)=500-950/1.15=-7500/23
50y/207=-7500/23
y=-1350
x=y+950=2300