已知丨2x-4丨+(y+3)的2次方=0,求x+y的值
问题描述:
已知丨2x-4丨+(y+3)的2次方=0,求x+y的值
答
丨2x-4丨+(y+3)²=0
则 |2x-4丨=0 ,(y+3)²=0
2x-4=0 y+3=0
2x=4,Y=-3
X=2,
x+y=2+(-3)=-1