Tính các phép tính sau 7/8 x 2/5 b) 6/15 : 12/3 c)7/4 -1/4 :1/2

a) \(\frac{7}{8} \times \frac{2}{5}\)

= \(\frac{7}{{20}}\)

b) \(\frac{6}{{15}}:\frac{{12}}{3}\)

= \(\frac{6}{{15}} \times \frac{3}{{12}}\)

= \(\frac{1}{{10}}\)

c) \(\frac{7}{4} - \frac{1}{4}:\frac{1}{2}\)

= \(\frac{7}{4} - \frac{1}{4} \times 2\)

= \(\frac{7}{4} - \frac{1}{2}\)

= \(\frac{5}{4}\)