Example

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

Question

$$-3.7-8.4$$

Answer

-12.1

Solution


Use this rule: \(-a-b=-(a+b)\).
\[-(3.7+8.4)\]
Use the algorithm method.
11
3.7
+8.4
12.1
After simplification, we have:
\[-(3.7+8.4)=-12.1\]
Therefore, \(-3.7-8.4=-12.1\).
\[-12.1\]
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