Example

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

Question

$$45-66$$

Answer

-21

Solution


Use this rule: \(a-b=-(b-a)\).
\[-(66-45)\]
Use the algorithm method.
66
-45
21
After simplification, we have:
\[-(66-45)=-21\]
Therefore, \(45-66=-21\).
\[-21\]
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