【5xy的平方(x的平方-3xy)-(-3x的平方y的平方)的立方/(5xy)的平方
=[5xy²(x²-3xy)-(-3x²y²)³/(5xy)²
=(5x³y²-15x²y³+27x^6y^6)÷25x²y²
=1/5x-3/5y+27/25x^4y^4
【5xy的平方(x的平方-3xy)-(-3x的平方y的平方)的立方/(5xy)的平方
=[5xy²(x²-3xy)-(-3x²y²)³/(5xy)²
=(5x³y²-15x²y³+27x^6y^6)÷25x²y²
=1/5x-3/5y+27/25x^4y^4