Đề bài

Tính một cách hợp lí:

a) $\dfrac{{ - 3}}{{11}} + 0,35 - \dfrac{8}{{11}}$;                     

b) $\dfrac{9}{{19}} - 1,251 + \dfrac{{10}}{{19}} + 1,251$;

c) $- 8.\dfrac{{24}}{7}.0,125$;                                                    

d) $0,25.\dfrac{7}{{15}} - \dfrac{1}{4}.\dfrac{{ - 8}}{{15}} + 2,75$.