你好
1
2
x^3+3x+4
=x^3+x^2-x^2+3x+4
=x^2(x+1)-(x^2-3x-4)
=x^2(x+1)-(x-4)(x+1)
=(x^2-x+4)(x+1)
3
4x^4-13x^2+9
=(4x^2-9)(x^2-1)
=(2X+3)(2X-3)(x-1)(x+1)
你好
1
2
x^3+3x+4
=x^3+x^2-x^2+3x+4
=x^2(x+1)-(x^2-3x-4)
=x^2(x+1)-(x-4)(x+1)
=(x^2-x+4)(x+1)
3
4x^4-13x^2+9
=(4x^2-9)(x^2-1)
=(2X+3)(2X-3)(x-1)(x+1)