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A)x2-8x+15 =x2-3x- 5x+15 =x×(x-3) - 5x+15 = (x-3)× (x-5).
Б)5х2+9х-2 = 5x2+ 10x-x-2 = 5x×(x+ 2) - x-2 = (x+2)×(5x-1).