计算:(1)(-xy)^5/(-xy)^3 (2)(-a^3)^5/【(-a^2)*(-a^3)^2】 (3)(x^6/x^2)^2+x^9/x^3*x^2(1)(-xy)^5/(-xy)^3(2)(-a^3)^5/【(-a^2)*(-a^3)^2】(3)(x^6/x^2)^2+x^9/x^3*x^2
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