Question

Tính:

a)\(5,75.\frac{{ - 8}}{9}\);              

b)\(2\frac{3}{8}.\left( { - 0,4} \right)\);            

c)\(\frac{{ - 12}}{5}:\left( { - 6,5} \right)\).

Answer 1

a)\(5,75.\frac{{ - 8}}{9} =\frac{{575}}{100}.\frac{{ - 8}}{9}= \frac{{23}}{4}.\frac{{ - 8}}{9} = \frac{{ - 46}}{9}\)

b)\(2\frac{3}{8}.\left( { - 0,4} \right) = \frac{{19}}{8}.\frac{{ - 4}}{10} =\frac{{19}}{8}.\frac{{ - 2}}{5} = \frac{{ - 19}}{{20}}\);            

c)\(\frac{{ - 12}}{5}:\left( { - 6,5} \right) = \frac{{ - 12}}{5}:\frac{{ - 65}}{10} =\frac{{ - 12}}{5}:\frac{{ - 13}}{2} = \frac{{ - 12}}{5}.\frac{{ - 2}}{{13}} = \frac{{24}}{{65}}\).

Answer 2