问题标题:
【一道因式分解题,解出来给分(10)x^4+y^4+z^4-2x^2y^2-2x^2z^2-2y^2z^2用设元法,】
问题描述:
一道因式分解题,解出来给分(10)
x^4+y^4+z^4-2x^2y^2-2x^2z^2-2y^2z^2
用设元法,
刘宗乾回答:
x^4+y^4+z^4-2x^2y^2-2x^2z^2-2y^2z^2
=(x^2-y^2-z^2)^2-4y^2z^2
=(x^2-y^2-z^2-2yz)(x^2-y^2-z^2+2yz)
=[x^2-(y+z)^2][x^2-(y-z)^2]
=(x-y-z)(x+y+z)(x+y-z)(x+z-y)
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