整式A与m²-2mn+n²的和是m²+2mn+n²则A=

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整式A与m²-2mn+n²的和是m²+2mn+n²则A=整式A与m²-2mn+n²的和是m²+2mn+n²则A=整式A与

整式A与m²-2mn+n²的和是m²+2mn+n²则A=
整式A与m²-2mn+n²的和是m²+2mn+n²则A=

整式A与m²-2mn+n²的和是m²+2mn+n²则A=
解
A与m²-2mn+n²的和是m²+2mn+n²
∴
A=(m²+2mn+n²)-(m²-2mn+n²)
=(m²-m²)+(2mn+2mn)+(n²-n²)
=4mn
∴A=4nm