如果2m2-2mn+n2+4m+4=0,那m2n+mn2等于多少
2个回答
2m²-2mn+n²+4m+4=0
m²-2mn+n²+m²+4m+4=0
(m-n)²+(m+2)²=0
m+2=0 m=-2
m-n=0 n=m=-2
m²n+mn²=2m³=2(-2)³=-16
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