若|m-3|+|n+2|等于0,则m+2n等于几

若|m-3|+|n+2|等于0,则m+2n等于几
若|m-3|+|n+2|等于0,则m+2n等于几

若|m-3|+|n+2|等于0,则m+2n等于几
若|m-3|+|n+2|等于0
,m-3=0 n+2=0
m=3 n=-2
,则m+2n
=3+2*(-2)
=3-4
=-1

很简单啊，等于-1

因为绝对值m-3 +绝对值n+2 =0
所以绝对值m-3=0 绝对值n+2=0
所以m=3 n=-2
所以m+2n=3+2*（-2）=3-4=-1

因为|m-3|和|n-2|一定大于或等于零，而因为它们相加等于零，所以m-3=n-2=0 所以m=3,n=2.m+2n=3+4=7.懂了？