因式分解,如下图
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因式分解,如下图
x^4+y^4+(x+y)^4
=(x²+y²)²-2x²y²+(x+y)^4
=(x²+y²)²-x²y²+(x+y)^4-x²y²
=(x²+y²+xy)(x²+y²-xy)+[(x+y)²+xy][(x+y)²-xy]
=(x²+y²+xy)(x²+y²-xy)+(x²+y²+3xy)(x²+y²+xy)
=(x²+y²+xy)[(x²+y²-xy)+(x²+y²+3xy)]
=(x²+y²+xy)(2x²+2y²+2xy)
=2(x²+y²+xy)²
x^4+y^4+(x+y)^4
=(x²+y²)²-2x²y²+(x+y)^4
=(x²+y²)²-x²y²+(x+y)^4-x²y²
=(x²+y²+xy)(x²+y²-xy)+[(x+y)²+xy][(x+y)²-xy]
=(x²+y²+xy)(x²+y²-xy)+(x²+y²+3xy)(x²+y²+xy)
=(x²+y²+xy)[(x²+y²-xy)+(x²+y²+3xy)]
=(x²+y²+xy)(2x²+2y²+2xy)
=2(x²+y²+xy)²
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