Tính 3/4 + 5/6 ,.....
Giải thích
\[\frac{3}{4} + \frac{5}{6} = \frac{9}{{12}} + \frac{{10}}{{12}} = \frac{{19}}{{12}}\] | \[\frac{5}{3} - \frac{1}{2} = \frac{{10}}{6} - \frac{3}{6} = \frac{7}{6}\] |
\[\frac{8}{{15}} \times \frac{5}{{56}} = \frac{{8 \times 5}}{{5 \times 3 \times 8 \times 7}} = \frac{1}{{3 \times 7}} = \frac{1}{{21}}\] | \[\frac{{42}}{{50}}:\frac{7}{{12}} = \frac{{42}}{{50}} \times \frac{{12}}{7} = \frac{{6 \times 7 \times 2 \times 6}}{{25 \times 2 \times 7}}\]= \(\frac{{36}}{{25}}\) |