Thực hiện phép tính: a) (15,25 + 3,75).4 + (20,71 + 5,29).5; b) \(\frac{4}{{20}} + \frac{{16}}{{42}} + \frac{6}{{15}} + \frac{{ – 3}}{5} + \frac{2}{{21}} + \frac{{ – 10}}{{21}} + \frac{3}{{20}}\); c) \(\frac{5}{{11}}.\frac{5}{7} + \frac{5}{{11}}.\frac{2}{7} + \frac{6}{{11}};\) d) \(\left( { – \frac{5}{{24}} + 0,75 + \frac{7}{{12}}} \right):\left( { – 2\frac{1}{8}} \right)\).
Câu hỏi: Thực hiện phép tính: a) (15,25 + 3,75).4 + (20,71 + 5,29).5; b) \(\frac{4}{{20}} + \frac{{16}}{{42}} + \frac{6}{{15}}…