Example

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

Question

$$2\frac{1}{2}\cdot4-5\frac{1}{4}; \frac{3}{7}[$$

Answer

42-51/4;37[

Solution


Use this rule: \(\frac{a}{b} \times c=\frac{ac}{b}\).
Simplify  \(21\times 4\)  to  \(84\).
Simplify  \(\frac{84}{2}\)  to  \(42\).
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