计算(X-Y / X+2Y)的三次方等于_____.

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计算(X-Y/X+2Y)的三次方等于_____.计算(X-Y/X+2Y)的三次方等于_____.计算(X-Y/X+2Y)的三次方等于_____.(X-Y)^3/(X+2Y)^3=(X^3-3X^Y+3

计算(X-Y / X+2Y)的三次方等于_____.
计算(X-Y / X+2Y)的三次方等于_____.

计算(X-Y / X+2Y)的三次方等于_____.
(X-Y)^3/(X+2Y)^3
=(X^3-3X^Y+3XY^2-Y^3)/(X^3+6X^2Y+12XY^2+8Y^3)