Question

Tính.

\(\dfrac{6}{5}+\dfrac{7}{15}\)                   \(\dfrac{15}{16}-\dfrac{3}{4}\)                   \(\dfrac{3}{8}+4\)                     \(3-\dfrac{16}{7}\)

Answer 1

\(3-\dfrac{16}{7}=\dfrac{21}{7}-\dfrac{16}{7}=\dfrac{21-16}{7}=\dfrac{5}{7}\)

\(\dfrac{3}{8}+4=\dfrac{3}{8}+\dfrac{32}{8}=\dfrac{3+32}{8}=\dfrac{35}{8}\)

\(\dfrac{15}{16}-\dfrac{3}{4}=\dfrac{15}{16}-\dfrac{12}{16}=\dfrac{15-12}{16}=\dfrac{3}{16}\)

\(\dfrac{6}{5}+\dfrac{7}{15}=\dfrac{18}{15}+\dfrac{7}{15}=\dfrac{18+7}{15}=\dfrac{25}{15}=\dfrac{5}{3}\)