Example

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

Question

$$\begin{aligned}55&\\ -100&\end{aligned}$$

Answer

-45

Solution


Use this rule: \(a-b=-(b-a)\).
\[-(100-55)\]
Use the algorithm method.
0910
100
-55
45
After simplification, we have:
\[-(100-55)=-45\]
Therefore, \(55-100=-45\).
\[-45\]
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