Question
Answer
$$9r\cdot81(-10r\cdot64)=-466560r^2$$
Explanation
| $$ \begin{aligned}9r\cdot81(-10r\cdot64)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}729r\cdot-640r \xlongequal{ } \\[1 em] & \xlongequal{ }-466560r^2\end{aligned} $$ | |
| ① | $$ 9 r \cdot 81 = 729 r $$$$ 10 r \cdot 64 = 640 r $$ |
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