1)(a-b)²=a²-2ab+b²
2)a²+2ab+b²=(a+b)²
3)(a+b)(a-b)=a²-b²
4)(2m+n)²=(2m)²+2m•n•2+n²=4m²+4mn+n²
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1)(a-b)²=a²-2ab+b²
2)a²+2ab+b²=(a+b)²
3)(a+b)(a-b)=a²-b²
4)(2m+n)²=(2m)²+2m•n•2+n²=4m²+4mn+n²