№ 1.Выделим квадрат двучлена из данного квадратного трехчлена:2х2 – 4х + 6 = 2 (х2 – 2х + 3) = 2 (х2 – 2 · 1 · х + 12 – 12 + 3) = 2 ((х – 1)2 + + 2) = 2 (х – 1)2 + 4.
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