(-x-2y)(x^2-2xy+4y^2) 计算
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(-x-2y)(x^2-2xy+4y^2) 计算
(-x-2y)(x^2-2xy+4y^2) 计算
(-x-2y)(x^2-2xy+4y^2) 计算
(-x-2y)(x^2-2xy+4y^2)
=-x^3-8y^3
直接利用a^3+b^3=(a+b)(a^2-ab+b^2)
将a=-x
b=-2y
代入就可以了.
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