Thực hiện phép tính (tính hợp lí nếu có thể):   a) 1,56 + 8,44:4,22;   b) 5/7 + 4/- 14

a) \(1,56 + 8,44:4,22\)

\( = 1,56 + 2\)

\( = 3,56\)

c) \(8,712.5,18 + 5,18.2,788 + 11,5.4,82\)

\[ = 5,18.\left( {8,712 + 2,788} \right) + 11,5.4,82\]

\[ = 5,18.11,5 + 11,5.4,82\]

\[ = 11,5.\left( {5,18 + 4,82} \right)\]

\[ = 11,5.10\]

\( = 115\)

b) \[\frac{5}{7} + \frac{4}{{ - 14}}\]

\[ = \frac{5}{7} + \frac{{ - 2}}{7}\]\[ = \frac{3}{7}\].

d) \({\left( { - 2} \right)^3}.\frac{{ - 1}}{{24}} + \left( {\frac{4}{5} - 1,2} \right):\frac{2}{{15}}\)

\( = \left( { - 8} \right).\frac{{ - 1}}{{24}} + \left( {\frac{4}{5} - \frac{6}{5}} \right).\frac{{15}}{2}\)

\( = \frac{1}{3} + \frac{{ - 2}}{5}.\frac{{15}}{2}\)

\( = \frac{1}{3} + \left( { - 3} \right)\)

\( = \frac{{ - 8}}{3}\).