Question

Solve:
$\left\{\frac{7}{5}\times \left(\frac{-3}{12}\right)\right\}+\left\{\frac{7}{5}\times \frac{5}{12}\right\}$

Answer 1

Let$A=\{\frac{7}{5}\times (-\frac{3}{12})\}+\{\frac{7}{5}\times \frac{5}{12}\}$

$A=\left\{\frac{-7\times 3}{5\times 12}\right\}+\left\{\frac{7\times 5}{5\times 12}\right\}$

$=-\frac{21}{60}+\frac{35}{60}$

$=\frac{35-21}{60}$

$=\frac{14}{60}$

$A=\frac{7}{30}$

$\therefore \{\frac{7}{5}\times (-\frac{3}{12})\}+\{\frac{7}{5}\times \frac{5}{12}\}=\frac{7}{30}$