(3a^3/X+Y)^3*(X^2-Y^2)除以(Y-X/Y+X)^2
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(3a^3/X+Y)^3*(X^2-Y^2)除以(Y-X/Y+X)^2

=27a^9/(x+y)^3*(x-y)(x+y)*(x+y)^2/(x-y)^2

=27a^3/(x-y)

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