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=(m

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)