因式分解求大神
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x^4+x^3+x^2-1
=x^4-1+x^3+x^2
=(x^2+1)(x^2-1)+x^2(x+1)
=(x^2+1)(x^2-1)+x^2(x+1)
=(x^2+1)(x+1)(x-1)+x^2(x+1)
=(x+1)(x^3-x^2+x-1+x^2)
=(x+1)(x^3+x-1)
x^2y^2-x^2z^2-y^2z^2+z^4
=(x^2y^2-x^2z^2)-(y^2z^2-z^4)
=x^2(y^2-z^2)-z^2(y^2-z^2)
=(y^2-z^2)(x^2-z^2)
=(y+z)(y-z)(x+z)(x-z)
=x^4-1+x^3+x^2
=(x^2+1)(x^2-1)+x^2(x+1)
=(x^2+1)(x^2-1)+x^2(x+1)
=(x^2+1)(x+1)(x-1)+x^2(x+1)
=(x+1)(x^3-x^2+x-1+x^2)
=(x+1)(x^3+x-1)
x^2y^2-x^2z^2-y^2z^2+z^4
=(x^2y^2-x^2z^2)-(y^2z^2-z^4)
=x^2(y^2-z^2)-z^2(y^2-z^2)
=(y^2-z^2)(x^2-z^2)
=(y+z)(y-z)(x+z)(x-z)
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