$$ \begin{aligned}\frac{(-1)^{1/3}}{4\cdot(-1)^{3/3}}& \xlongequal{ }\frac{(-1)^{1/3}}{4\cdot(-1)} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{(-1)^{1/3}}{-4}\end{aligned} $$ | |
① | $ 4 \cdot ( -1 ) = -4 $ |