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297а)-(а+b)(a+b)=-(a+b)^2=-a^2-2ab-b^2в) -(x-y)(x-y)=-(x-y)^2=-x^2+2xy-y^2д) -(5a-2b)(3b+2a)=-(15ab+10a^2-6b^2-2ab)=-13ab-10a^2+6b^2Примечание: ^2 - выражение в квадрате
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ma220299
A) -(a+b)(a+b)=-(a²+2ab+b²)=-a²-2ab-b² в) -(x-y)(x-y)=-(x²-2xy+y²)=-x²+2xy-y² д) -(5a-2b)(3b+2a)=-(15ab+10a²-6b²-4ab)=-10a²+6b²-11ab
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в) -(x-y)(x-y)=-(x²-2xy+y²)=-x²+2xy-y²
д) -(5a-2b)(3b+2a)=-(15ab+10a²-6b²-4ab)=-10a²+6b²-11ab