Tính: a) \(4\frac{3}{5} - 2\frac{1}{4} = \)
Giải thích
a) \(4\frac{3}{5} - 2\frac{1}{4} = \frac{{23}}{5} - \frac{9}{4} = \frac{{92}}{{20}} - \frac{{45}}{{20}} = \frac{{47}}{{20}}\)
b) \(2\frac{2}{3}:1\frac{2}{5} = \frac{8}{3}:\frac{7}{5} = \frac{8}{3} \times \frac{5}{7} = \frac{{40}}{{21}}\)