化简(-x-y)^3 这样做,对么?(-x)^3+3(-x)^2(-y)+3(-x)(-y)^3+(-y)^3=-x^3
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化简(-x-y)^3
这样做,对么?
(-x)^3+3(-x)^2(-y)+3(-x)(-y)^3+(-y)^3=-x^3-3x^2y-3xy^2-3y^3
这样做,对么?
(-x)^3+3(-x)^2(-y)+3(-x)(-y)^3+(-y)^3=-x^3-3x^2y-3xy^2-3y^3
![化简(-x-y)^3 这样做,对么?(-x)^3+3(-x)^2(-y)+3(-x)(-y)^3+(-y)^3=-x^3](/uploads/image/z/17638596-36-6.jpg?t=%E5%8C%96%E7%AE%80%28-x-y%29%5E3+%E8%BF%99%E6%A0%B7%E5%81%9A%EF%BC%8C%E5%AF%B9%E4%B9%88%EF%BC%9F%EF%BC%88-x%29%5E3%2B3%28-x%29%5E2%28-y%EF%BC%89%2B3%28-x%29%28-y%29%5E3%2B%28-y%29%5E3%3D-x%5E3)
错.
(-X-Y)^3=-(X+Y)^3=-(X+Y)(X+Y)(X+Y)=-(X^3+2X^2Y+XY^2+X^2Y+2XY^2+Y^3)=X^3+3X^2Y+3XY^2+Y^3
(-X-Y)^3=-(X+Y)^3=-(X+Y)(X+Y)(X+Y)=-(X^3+2X^2Y+XY^2+X^2Y+2XY^2+Y^3)=X^3+3X^2Y+3XY^2+Y^3
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