x^2-3y^2-8z^2-2xy-2zx+14yz
=x^2-2xy-3y^2+14yz-2xz-8z^2
=(x-3y)(x+y)+14yz-2xz-8z^2
=(x-3y+2z)(x+y-4z)
分解因式x^2-3y^2-8z^2-2xy+2zx+14yz
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