2ху - х² + 2ху - у² - 2х² = х²-у²
-х² -у² - 2х² = х²-у²
-х(х+у²+2х) = х²-у²
что -то не так ://
16⋅m² - 40⋅m⋅n + 25⋅n² = (4m)² - 2⋅4m⋅5n + (5n)² = (4m-5n)² =
= (4m-5n)(4m-5n)
(4√x+√y)2-8√xy=8<u /><span>√x+2</span><span>√y-8</span><span>√x</span><span>√y=8</span><span>√x(1+</span><span>√y)+2</span><span>√y</span>