Ответ:
(5x)²-2×5xb+b²=25x²-10bx+b²
(-6x)²-2×(-6)x×7y+(7y)²=36x²+84xy+49y²
(7y)²+2×7y×6x+(6x)²=49y²+84xy+36x².
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Ответ:
(5x)²-2×5xb+b²=25x²-10bx+b²
(-6x)²-2×(-6)x×7y+(7y)²=36x²+84xy+49y²
(7y)²+2×7y×6x+(6x)²=49y²+84xy+36x².