28y²(2x-3)+49xy(3-2x)
Решите задачу:
28y²(2x-3)+49xy(3-2x) =
7y(4y(2x-3)+7x(3-2x)) =
7y(4y(2x-3)-7x(2x-3)) =
7y(2x-3)(4y-7x).