Объяснение:
1) (a+2)(a-2)=a²-4
2) (2x-y)²=4x²-4xy+y²
3) (5x+2y)²=25x²+20xy+4y²
4) 4m²+4m+1=(2m+1)²
5) m²+4n²-4mn=m²-4mn+4n²=(m-2n)²
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Объяснение:
1) (a+2)(a-2)=a²-4
2) (2x-y)²=4x²-4xy+y²
3) (5x+2y)²=25x²+20xy+4y²
4) 4m²+4m+1=(2m+1)²
5) m²+4n²-4mn=m²-4mn+4n²=(m-2n)²