Решите задачу:
(x-y)²-x*(x-2y)=x²-2xy+y²-x²+2xy=y². a*(a+2b)-(a+b)²=a²+2ab-a²-2ab-b²=-b².
Невер о
(x-y)²-x*(x-2y)=x²-2xy+y²-x²+2xy=y² a*(a+2b)-(a+b)²=a²+2ab-(a²+2ab+b²)=a²+2ab-a²-2ab-b²=-b²