x3+y3怎样化成（x+y）（x2-xy+y2)
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x3+y3怎样化成（x+y）（x2-xy+y2)x3+y3怎样化成（x+y）（x2-xy+y2)x3+y3怎样化成（x+y）（x2-xy+y2)x3+y3=x³+x²y-x
x3+y3怎样化成（x+y）（x2-xy+y2)
x3+y3怎样化成（x+y）（x2-xy+y2)
x3+y3怎样化成（x+y）（x2-xy+y2)
x3+y3
=x³+x²y-x²y-xy²+xy²+y³
=x²(x+y)-xy(x+y)+y²(x+y)
=(x+y)（x²-xy+y²）