Example

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

Question

$$\begin{aligned}3069&\\ \underline{-4378}&\end{aligned}$$

Answer

-1309

Solution


Use this rule: \(a-b=-(b-a)\).
\[-(4378-3069)\]
Use the algorithm method.
618
4378
-3069
1309
After simplification, we have:
\[-(4378-3069)=-1309\]
Therefore, \(3069-4378=-1309\).
\[-1309\]
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