原式=（81x^12y^8)÷（36x^4y^2)-(1/9x^6y^4)(1/4x^2y^2)
=9/4x^8y^6-1/36x^8y^6
=20/9x^8y^6
(3x^3y^2)^4÷(6x^2y)^2-(-1/3x^3y^2)^2·(1/2xy)^2
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