问题156: ｛-3［-（-xy）³］²-（-x²y²）³｝:（-x²y³）²

$$\begin{aligned} & \left\{-3\left[-(x y)^3\right]^2-\left(-x^2 y^2\right)^3\right\}:\left(-x^2 y^3\right)^2:(2 x y)^3: x \\ = & \frac{-2 x^6 y^6}{x^4 y^6 \cdot 8 x^3 y^3 \cdot x} \\ = & -\frac{1}{4 x^2 y^3} \end{aligned}$$

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