Question

$\frac{a+a{2} }{6} ×\frac{18}{a+1}$

Answer 1

$\frac{a + a \times 2}{6} \times \frac{18}{a + 1} \\ (a + 2a) \times \frac{3}{a + 1} \\ 3a \times \frac{3}{a + 1} \\ \frac{9a}{a + 1}$