Đề bài

Tính:

a)$\frac{2}{{15}} + \left( {\frac{{ - 5}}{{24}}} \right)$           

b) $\left( {\frac{{ - 5}}{9}} \right) - \left( { - \frac{7}{{27}}} \right);$           

c)$\left( { - \frac{7}{{12}}} \right) + 0,75$

d)$\left( {\frac{{ - 5}}{9}} \right) - 1,25$          

e)$0,34.\frac{{ - 5}}{{17}}$                       

g) $\frac{4}{9}:\left( { - \frac{8}{{15}}} \right);$

h)$\left( {1\frac{2}{3}} \right):\left( {2\frac{1}{2}} \right)$       

i) $\frac{2}{5}.\left( { - 1.25} \right)$                     

k) $\left( {\frac{{ - 3}}{5}} \right).\left( {\frac{{15}}{{ - 7}}} \right).3\frac{1}{9}$