令f(x)=x^4+mx²-4∵x²+1是因式f[(-1)^½]=0[(-1)^½)^4+m[(-1)^½]²-4=01-m-4=0m=-3x^4+mx²-4=x^4-3x²-4,用多项式除法化简=(x²-4)(x²+1) =(x+2)(x-2)(x²+1)...