计算:(X+Y)(X^2-XY+Y^2)
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计算:(X+Y)(X^2-XY+Y^2)计算:(X+Y)(X^2-XY+Y^2)计算:(X+Y)(X^2-XY+Y^2)(X+Y)(X^2-XY+Y^2)=(x*x^2-x*xy+x*y^2)+(x^
计算:(X+Y)(X^2-XY+Y^2)
计算:(X+Y)(X^2-XY+Y^2)
计算:(X+Y)(X^2-XY+Y^2)
(X+Y)(X^2-XY+Y^2)
=(x*x^2-x*xy+x*y^2)+(x^2y-xy^2+y^3)
=x^3+y^3
这个是立方和的公式,再给你一个
x^3-y^3=(X-Y)(X^2+XY+Y^2)
这是立方差的公式
x^3+y^3
对楼主无语。
x^3+y^3=(x+y)(x^2-xy+y^2)
x^3-y^3=(x-y)(x^2+xy+y^2)