Tính bằng cách thuận tiện. 

\(\frac{9}{{14}}\) × 70 000 + 25 000 : \(\frac{5}{3}\) = ………………………………… = ………………………………… = …………………………………

3 – \(\frac{3}{5}\) × \(\frac{7}{2}\) : \(\frac{7}{5}\) = ………………………………… = ………………………………… = …………………………………22222222

Đáp án đúng là: B

\(\frac{{64}}{{72}}\) = \(\frac{{64:8}}{{72:8}}\) = \(\frac{8}{9}\).

Đáp án đúng là: A

\(\frac{3}{8}\) + \(\frac{1}{2}\) = \(\frac{3}{8}\) + \(\frac{4}{8}\) = \(\frac{7}{8}\) = \(\frac{{42}}{{48}}\)

\(\frac{3}{4}\) × \(\frac{5}{6}\) = \(\frac{5}{8}\) = \(\frac{{30}}{{48}}\)

1 – \(\frac{1}{6}\) = \(\frac{6}{6}\) – \(\frac{1}{6}\) = \(\frac{5}{6}\) = \(\frac{{40}}{{48}}\)

\(\frac{5}{8}\) : \(\frac{6}{7}\) = \(\frac{5}{8}\) × \(\frac{7}{6}\) = \(\frac{{35}}{{48}}\)

Mà \(\frac{{42}}{{48}}\) > \(\frac{{40}}{{48}}\) > \(\frac{{35}}{{48}}\) > \(\frac{{30}}{{48}}\).

Vậy phép tính có kết quả lớn nhất là: \(\frac{3}{8}\) + \(\frac{1}{2}\).