求大神分解这些因式2x^5-7x^3-4xX^4-x^2+4x-47x^2-5x+565x^-1280x

2x^5-7x^3-4x=x(2x^4-7x²-4)=x(x²-4)(2x²+1)=x(x-2)(x+2)(2x+1)X^4-x^2+4x-4=x²(x²-1)+4(x-1)=x²(x-1)(x+1)+4(x-1)=(x-1)(x³+x²+4)7x^2-5x+56这个题目是错的5x^5-1280x=5x(...