若|m-3|+(n+2)²=0,则m+2n的值为多少
问题描述:
若|m-3|+(n+2)²=0,则m+2n的值为多少
答
|m-3|+(n+2)²=0,
所以m-3=n+2=0
m=3,n=-2
所以m+2n
=3-4
=-1