若|m-3|+(n+2)²=0,则m+2n的值是多少
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若|m-3|+(n+2)²=0,则m+2n的值是多少
若|m-3|+(n+2)²=0,则m+2n的值是多少
若|m-3|+(n+2)²=0,则m+2n的值是多少
审题后,发现m-3=0,n+2=0,得出m=3,n=-2
所以m+2n=3+2*(-2)=3-4=-1