$$ \begin{aligned}\frac{3x}{x^2(x-6)}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{3x}{x^3-6x^2}\end{aligned} $$ | |
① | Multiply $ \color{blue}{x^2} $ by $ \left( x-6\right) $ $$ \color{blue}{x^2} \cdot \left( x-6\right) = x^3-6x^2 $$ |