Example

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

Question

$$\begin{aligned}72&\\ \underline{-92}&\end{aligned}$$

Answer

-20

Solution


Use this rule: \(a-b=-(b-a)\).
\[-(92-72)\]
Use the algorithm method.
92
-72
20
After simplification, we have:
\[-(92-72)=-20\]
Therefore, \(72-92=-20\).
\[-20\]
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