(-2x的平方y的立方)的2次方乘以(-3x的平方y)的立方除以(-2分之1x的5次方y的4次方)
=4x^4y^6×(-27x^6y^3)÷(-1/2x^5y^4)
=-108x^10y^9÷(-1/2x^5y^4)
=216x^5y^5