ах²+bx²-bx-ax+a+b = x²(a+b) -x(a+b) +(a+b) = (a+b) (x²-x+1)
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ах²+bx²-bx-ax+a+b = x²(a+b) -x(a+b) +(a+b) = (a+b) (x²-x+1)