Ответ:
(а+2аb+b)-c²=(a+b)²-c²=(a+b)(a+b)-c²
1-(x²-2xy+y²)=1-(x-y)²=1-(x-y)(x+y)
4+(-x²-2xy-y²)=4+(-x+y)²
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Ответ:
(а+2аb+b)-c²=(a+b)²-c²=(a+b)(a+b)-c²
1-(x²-2xy+y²)=1-(x-y)²=1-(x-y)(x+y)
4+(-x²-2xy-y²)=4+(-x+y)²