计算 (5y/6x^3)^2·{-(3x^4/5y^2)}^3
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计算 (5y/6x^3)^2·{-(3x^4/5y^2)}^3
计算 (5y/6x^3)^2·{-(3x^4/5y^2)}^3
计算 (5y/6x^3)^2·{-(3x^4/5y^2)}^3
=25y^2 / (36x^6) {-(27x^12)/(125y^6)}
=-(25/36) * (27/125) * y^(2-6) / x^(6-12)
=-(3/20) * x^6/y^4
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