Question

Докажите тождество :
(a+b)²-2ab+a²-b²=a*2b

Answer 1

(a+b)²-2ab+a²-b²=a·2b;
(a+b)²-2ab+a²-b²=a²+2ab+b²-2ab+a²-b²=2a²;
2a²≠a·2b;