3x的五次方-8x的四次方+x的平方+12x+4

3x^5-8x^4+x^2+12x+4=3x^5-6x^4-2x^4+4x^3-4x^3+8x^2-7x^2+14x-2x+4=3x^4(x-2)-2x^3(x-2)-4x^2(x-2)-7x(x-2)-2(x-2)=(x-2)(3x^4-2x^3-4x^2-7x-2)=(x-2)(3x^4+x^3-3x^3-x^2-3x^2-x-6x-2)=(x-2)[x^3(3x+1)-x^2(3x+1)-x...