Đề bài

Tính. a) \(\frac{{ - 2}}{7}:\frac{4}{7}\) b) \(\frac{{ - 4}}{5}:\frac{{ - 3}}{{11}}\) c) \(4:\frac{{ - 2}}{5}\) d) \(\frac{{15}}{{ - 8}}:6\)

Lời giải chi tiết

a) \(\frac{{ - 2}}{7}:\frac{4}{7} = \frac{{ - 2}}{7}.\frac{7}{4} = \frac{{ - 2}}{4} = \frac{{ - 1}}{2}\)       b) \(\frac{{ - 4}}{5}:\frac{{ - 3}}{{11}} = \frac{{ - 4}}{5}.\frac{{11}}{{ - 3}} = \frac{{ - 44}}{{ - 15}} = \frac{{44}}{{15}}\) c) \(4:\frac{{ - 2}}{5} = 4.\frac{5}{{ - 2}} = \frac{{20}}{{ - 2}} =  - 10\) d) \(\frac{{15}}{{ - 8}}:6 = \frac{{15}}{{ - 8}}.\frac{1}{6} = \frac{{ - 15}}{{48}}= \frac{{ - 5}}{{16}}\).