Задание 1.

Разложите на множители

(m + 10)^2 − (n − 12)^2;
(с + 19d)^2 − (19с + d)^2.


Задание 2.

Докажите равенство:

(а + b + с)^2 = а^2 + 2ab + b^2 + 2аc + 2bс + с^2
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