Tính phép tính 1/2 + 1/8 7/12 x 6/21

\(\frac{1}{2}\) + \(\frac{1}{8}\) = …………………………

\(\frac{5}{{12}}\) – \(\frac{1}{3}\) = ………………………..

\(\frac{7}{{12}}\) × \(\frac{6}{{21}}\) = ………………………..

\(\frac{6}{{15}}\) : \(\frac{3}{{10}}\) = …………………………