﹣x四次方y五次方z五次方÷1/6xy四次方z³×﹙﹣1/2xyz²﹚²
=﹣x^4y^5z^5÷1/6xy四次方z³×﹙1/4x^2y^2z^4﹚
=﹣6x^3yz^2×﹙1/4x^2y^2z^4﹚
=﹣3/2x^5y^3z^6