(2х-5)²+20х = 4x² - 20x + 25 + 20x = 4x² + 25
36с-3(1+6с)² = 36c - 3 - 36c - 36c² = -3(12c²+1)
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(2х-5)²+20х = 4x² - 20x + 25 + 20x = 4x² + 25
36с-3(1+6с)² = 36c - 3 - 36c - 36c² = -3(12c²+1)
(1-3х)^2