Answer
$$2.18x\cdot10^{10}=2x$$
Explanation
| $$ \begin{aligned}2.18x\cdot10^{10}& \xlongequal{ }2.18x\cdot10000000000 \xlongequal{ } \\[1 em] & \xlongequal{ }2x\cdot10000000000 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x\end{aligned} $$ | |
| ① | $$ 2 x \cdot 10000000000 = 20000000000 x $$ |
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