Ko cần làm câu8 ạ 
Câu 7: Thực hiện phép tính:
a) \(-\frac{1}{3} - \frac{7}{24} : \frac{14}{36}\)
b) \(\frac{5}{4} - \frac{1}{2} + \frac{-7}{8}\)
Câu 9: Thực hiện phép tính:
a) \(-\frac{3}{14} + \frac{5}{8} - \frac{1}{2}\)
b) \(\frac{5}{23} \cdot \left(\frac{13}{5} - \frac{14}{4}\right)\)
Câu 10: Thực hiện phép tính:
a) \(-\frac{5}{8} : \frac{2}{3} + \frac{1}{4}\)
b) \(-\frac{5}{8} \cdot \left(\frac{2}{3} + \frac{1}{4}\right)\)
Câu 9:
a: \(-\dfrac{3}{14}+\dfrac{5}{8}-\dfrac{1}{2}=-\dfrac{3}{14}+\dfrac{5}{8}-\dfrac{4}{8}\)
\(=-\dfrac{3}{14}+\dfrac{1}{8}=-\dfrac{12}{56}+\dfrac{7}{56}=-\dfrac{5}{56}\)
b: \(\dfrac{5}{23}\left(\dfrac{13}{5}-\dfrac{14}{4}\right)\)
\(=\dfrac{5}{23}\left(\dfrac{13}{5}-\dfrac{7}{2}\right)=\dfrac{5}{23}\left(\dfrac{26}{10}-\dfrac{35}{10}\right)\)
\(=\dfrac{5}{23}\cdot\dfrac{-9}{10}=\dfrac{-9}{46}\)
Câu 10:
a: \(\dfrac{-5}{8}:\dfrac{2}{3}+\dfrac{1}{4}=-\dfrac{5}{8}\cdot\dfrac{3}{2}+\dfrac{1}{4}\)
\(=-\dfrac{15}{16}+\dfrac{1}{4}=-\dfrac{15}{16}+\dfrac{4}{16}=-\dfrac{11}{16}\)
b: \(-\dfrac{5}{8}\left(\dfrac{2}{3}+\dfrac{1}{4}\right)=-\dfrac{5}{8}\cdot\left(\dfrac{8}{12}+\dfrac{3}{12}\right)=-\dfrac{5}{8}\cdot\dfrac{11}{12}=-\dfrac{55}{96}\)
\(7.\)
\(a.-\dfrac{1}{3}.\dfrac{7}{24}:\dfrac{14}{16}\)
\(=\dfrac{-7}{72}:\dfrac{14}{16}\)
\(=\dfrac{-1}{9}\)
\(b.\dfrac{5}{4}-\dfrac{1}{2}+\dfrac{-7}{8}\)
\(=\dfrac{3}{4}+\dfrac{-7}{8}=\dfrac{-1}{8}\)
\(8.\)
\(a.\left(\dfrac{-5}{24}+\dfrac{3}{4}+\dfrac{7}{12}\right):\left(-\dfrac{15}{17}\right)\)
\(=\left(\dfrac{-5}{24}+\dfrac{17}{4}\right):\left(-\dfrac{15}{17}\right)\)
\(=\dfrac{97}{24}:\left(-\dfrac{15}{17}\right)=-\dfrac{1649}{360}\)
\(b.\left(\dfrac{2}{3}-\dfrac{11}{12}\right):2+\dfrac{17}{8}\)
\(=\left(\dfrac{-1}{4}\right):2+\dfrac{17}{8}\)
\(=\left(\dfrac{-1}{8}\right)+\dfrac{17}{8}=2\)
Đây có nhiều bài mà còn ở mức khá đơn giản, cụ thể em muốn hỗ trợ bài nào nè?
mng giúp mình với ạ, mng làm bnh thì mng làm ạ, kh cần làm hết đâu ạ
