〔5xy^2(x^2-3xy)-(-3x^2y^3)〕/2x^2y^2
=(5x³y² - 15x²y³+3x²y³)/(2x^2y^2)
=(5x³y² - 12x²y³)/(2x^2y^2)
=(5xy-12y)/2
=(5xy/2) - 6y
〔5xy^2(x^2-3xy)-(-3x^2y^3)〕/2x^2y^2
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计算：(5xy^2(x^2-3xy)-(-3x^2y)^2)/2x^2y^2