Tính: 3/2 + 2/3

Lời giải

a) \(\frac{3}{2} \times \frac{4}{5} + \frac{2}{3} = \frac{{3 \times \bcancel{2} \times 2}}{{\bcancel{2} \times 5}} + \frac{2}{3} = \frac{6}{5} + \frac{2}{3} = \frac{{18}}{{15}} + \frac{{10}}{{15}} = \frac{{28}}{{15}}\)

b) \(\frac{7}{4} - \frac{3}{4}:\frac{5}{6} = \frac{7}{4} - \frac{3}{4} \times \frac{6}{5} = \frac{7}{4} - \frac{{3 \times 3 \times \bcancel{2}}}{{2 \times \bcancel{2} \times 5}} = \frac{7}{4} - \frac{9}{{10}} = \frac{{28}}{{20}} - \frac{{18}}{{20}} = \frac{{10}}{{20}} = \frac{1}{2}\)