推导公式:(x+y)(x2-xy+y2)=x3+y3
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推导公式:(x+y)(x2-xy+y2)=x3+y3推导公式:(x+y)(x2-xy+y2)=x3+y3推导公式:(x+y)(x2-xy+y2)=x3+y3(x+y)(x²-xy+y
推导公式:(x+y)(x2-xy+y2)=x3+y3
推导公式:(x+y)(x2-xy+y2)=x3+y3
推导公式:(x+y)(x2-xy+y2)=x3+y3
(x+y)(x²-xy+y²)
=x(x²-xy+y²)+y(x²-xy+y²)
=x³-x²y+xy²+x²y-xy²+y³
=x³+(-1+1)x²y+(1-1)xy²+y³
=x³+y³
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(x＋y)(x²－xy＋y²)
=x(x²－xy＋y²)＋y(x²－xy＋y²)
=x³－x²y＋xy²＋x²y－xy²＋y³
=x³＋y³
左边=x³-x²y+xy²+yx²-xy²+y³=x³+y³=右边
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