August 2022 1 9 Report
Ребятки выручайте, срочно надо!!!!!!!!!!!))))))
Докажите тождество:
1) (а + b)a - (a - b)b = a^2 + b^2;

2) (a + b)a - (a + b)b = a^2-b^2;

3) (a + b)a + (a + b)b = a^2 + 2ab + b^2.
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