m²-1+4mn+4n²等于几

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m²-1+4mn+4n²等于几

m²-1+4mn+4n²等于几
m²-1+4mn+4n²等于几

m²-1+4mn+4n²等于几
m²-1+4mn+4n²
=（m²+4mn+4n²）-1
=（m+2n）²-1
=（m+2n+1）（m+2n-1）