Tính biểu thức Tính a) 6/5 + 9/10

7/30

Tính

a) \(\frac{6}{5} + \frac{9}{{10}}\) b) \(\frac{9}{{16}} - \frac{1}{4}\) c) \(\frac{7}{{18}} \times \frac{9}{4}\) d) \(\frac{8}{{15}}:\frac{7}{5}\)

e) \(\frac{4}{9} + \frac{7}{3}\) f) \(\frac{{11}}{{15}} - \frac{2}{5}\) g) \(\frac{7}{{24}} \times \frac{{12}}{{49}}\) h) \(\frac{9}{{20}}:\frac{5}{4}\)

Nhập câu trả lời ở đây

0/3000 ký tự

Giải thích

a) \(\frac{6}{5} + \frac{9}{{10}} = \frac{{12}}{{10}} + \frac{9}{{10}} = \frac{{21}}{{10}}\) b) \(\frac{9}{{16}} - \frac{1}{4} = \frac{9}{{16}} - \frac{4}{{16}} = \frac{5}{{16}}\)

c) \(\frac{7}{{18}} \times \frac{9}{4} = \frac{7}{8}\) d) \(\frac{8}{{15}}:\frac{7}{5} = \frac{8}{{15}} \times \frac{5}{7} = \frac{8}{{21}}\)

e) \(\frac{4}{9} + \frac{7}{3} = \frac{4}{9} + \frac{{21}}{9} = \frac{{25}}{9}\) f) \(\frac{{11}}{{15}} - \frac{2}{5} = \frac{{11}}{{15}} - \frac{6}{{15}} = \frac{5}{{15}} = \frac{1}{3}\)

g) \[\frac{7}{{24}} \times \frac{{12}}{{49}} = \frac{{\cancel{7} \times \cancel{{12}}}}{{\cancel{{12}} \times 2 \times \cancel{7} \times 7}} = \frac{1}{{14}}\] h) \(\frac{9}{{20}}:\frac{5}{4} = \frac{9}{{20}} \times \frac{4}{5} = \frac{9}{{25}}\)