Thực hiện phép tính (tính hợp lí nếu có thể): a) (- 0,4).(- 2,5).(- 0,8); b5/- 8 +7/8

a) \(\left( { - 0,4} \right).\left( { - 2,5} \right).\left( { - 0,8} \right)\)

\( = 1.\left( { - 0,8} \right)\)\( =  - 0,8\).

b) \(\frac{5}{{ - 8}} + \frac{7}{8}\)

\( = \frac{{ - 5}}{8} + \frac{7}{8}\)\( = \frac{2}{8}\).

c) \(914,75:5 + 211,2:5 - 101,95:5\)

\( = \left( {914,75 + 211,2 - 101,95} \right):5\)

\( = 1024:5\)

\( = 204,8\).

d) \(25\%  - 1\frac{1}{2} - {\left( { - \frac{1}{2}} \right)^2} + 0,25:\frac{1}{{12}}\)

\( = \frac{1}{4} - \frac{3}{2} - \frac{1}{4} + \frac{1}{4}.12\)

\( = \left( {\frac{1}{4} - \frac{1}{4}} \right) - \frac{3}{2} + 3\)

\( =  - \frac{3}{2} + \frac{6}{2}\)

\( = \frac{3}{2}\).