解方程组{4x+8(x+y)=480,4y+9(x+y)=480
问题描述:
解方程组{4x+8(x+y)=480,4y+9(x+y)=480
答
4x+8(x+y)=480
4y+9(x+y)=480
2式相减
x-y-(x+y)=0
-2y=0
y=0
x=40