$$ \begin{aligned}\frac{x^2+2x-80}{2x^3-24x+64x}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{x^2+2x-80}{2x^3+40x}\end{aligned} $$ | |
① | $$ 2x^3 \color{blue}{-24x} + \color{blue}{64x} = 2x^3+ \color{blue}{40x} $$ |