解:x^4-9 =(x²)²-3² =(x²+3)(x²-3) =(x²+3)[x²-(√3)²] =(x²+3)(x+√3)(x-√3)祝你开心
=(2x^2+3)(2x^2-3)=((根号2)x+根号3)((根号2)x-根号3)(2x^2+3)
x^4-9=(x^2+3)(x^2-3)=(x^2+3)(x-√3)(x+√3)
