\(\dfrac{5}{8}\)x\(\dfrac{3}{2}=\dfrac{15}{16}\)

\(1\)x\(\dfrac{14}{15}=\dfrac{14}{15}\)

Sau hai giờ ô tô đó chạy được là:

   \(\dfrac{3}{8}+\dfrac{2}{7}\)=\(\dfrac{37}{56}\)(quãng đường)

         Đáp số:\(\dfrac{37}{56}\) quãng đường

B.\(\dfrac{14}{10}\)

\(\dfrac{2}{10}+\dfrac{12}{10}=\dfrac{14}{10}\)

\(\dfrac{4}{5}+\dfrac{6}{5}=\dfrac{10}{5}=2\)

\(\dfrac{3}{5}+\dfrac{1}{1}=\dfrac{3}{5}+1=\dfrac{8}{5}\)

\(\dfrac{3}{5}+\left(\dfrac{3}{16}+\dfrac{13}{16}\right)=\dfrac{3}{5}+1=\dfrac{6}{5}\)

\(\dfrac{12}{5}+\dfrac{12}{4}=\dfrac{48}{20}+\dfrac{60}{20}=\dfrac{108}{20}=\dfrac{27}{5}\)

\(\dfrac{3}{7}+\dfrac{5}{6}=\dfrac{18}{42}+\dfrac{35}{42}=\dfrac{53}{42}\)

1,4