Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\begin{aligned}20&\\ \underline{\times20}&\end{aligned}$$

Answer

400

Solution


Use the algorithm method.
20
×20
400
Therefore, \(20\times 20=400\).
\[400\]
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