3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组
问题描述:
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组
答
5x+y=369y-x=2
即45y-10+y=36
y=1
x=7