Объяснение:
a²+2ab+b²=(a+b)²
x+2y-x²-4xy-4y²=x+2y-(x²+4xy+4y²)=(x+2y)-(x+2y)²=(x+2y)(1-x-2y)
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Объяснение:
a²+2ab+b²=(a+b)²
x+2y-x²-4xy-4y²=x+2y-(x²+4xy+4y²)=(x+2y)-(x+2y)²=(x+2y)(1-x-2y)