丨x+2y+3丨+(2x+y)²=0,求x-y的值
问题描述:
丨x+2y+3丨+(2x+y)²=0,求x-y的值
答
2x+y=0
x+2y=-3
两个式子相减
x-y=3
丨x+2y+3丨+(2x+y)²=0,求x-y的值
2x+y=0
x+2y=-3
两个式子相减
x-y=3