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mary235688

Ответ:

1) m^2-2mn+2n      2)x^2+2bx+b^2

Объяснение:

(x+b)^2

используя формулу (a+b)^2=a^2+2ab+b^2 записываем выражение в развёрнутом виде, и получаем ответ

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