化简因式x³-7x²+10x 2.x²(x-y)+(y-x)
问题描述:
化简因式x³-7x²+10x 2.x²(x-y)+(y-x)
答
x³-7x²+10x =x(x²-7x+10)=x(x-2)(x-5)
x²(x-y)+(y-x)=x²(x-y)-(x-y)=(x-y)(x²-1)=(x-y)(x+1)(x-1)