方程组X+Y=150,X*(1+15%)+Y*(1+10%)=170怎么解
问题描述:
方程组X+Y=150,X*(1+15%)+Y*(1+10%)=170怎么解
答
x*(1+15%)+y*(1+10%)=170,
(x+y)+10(x+y)%+5x%=170,
150+15+5x%=170,
5x%=5,
x=100,y=50.