(1) -8x^4+6x^3y^2-2x^3y (2) (a-b)^2-2(b-a)+1 (3)2x^n+1-8x^n-1 因式分解这三题
问题描述:
(1) -8x^4+6x^3y^2-2x^3y (2) (a-b)^2-2(b-a)+1 (3)2x^n+1-8x^n-1 因式分解这三题
答
(1) -8x^4+6x^2y^2-2x^3y =-2x²(4x²+3xy²-xy)(2) (a-b)^2-2(b-a)+1=(a-b)²+2(a-b)+1=(a-b+1)²(3)2x^n+1-8x^n-1=2x^n-1(x²-4)=2x^n-1(x+2)(x-2)