①x²-4x+9 ②4(x-y)²-4(y-x) ③3x(x-2)-(2-x) ④ -二分之一x的四次方+8

问题描述:

①x²-4x+9 ②4(x-y)²-4(y-x) ③3x(x-2)-(2-x) ④ -二分之一x的四次方+8

因式分解?①x²-4x+9题目可能写错了. ②4(x-y)²-4(y-x) =4(x-y)²+4(x-y) =4(x-y)[(x-y)+1]=4(x-y)(x-y+1)③3x(x-2)-(2-x) =3x(x-2)+(x-2)= (x-2)(3x+1)④ -二分之一x的四次方+8=(-1/2)(x的四次方-...