e) \(\dfrac{-7}{8}:\dfrac{21}{16}-\dfrac{5}{3}\cdot\left(\dfrac{1}{5}-\dfrac{7}{10}\right)=\dfrac{-7}{8}\cdot\dfrac{16}{21}-\dfrac{5}{3}\cdot\left(-\dfrac{1}{2}\right)=-\dfrac{2}{3}-\left(-\dfrac{5}{6}\right)=\dfrac{1}{6}\)
f) \(\dfrac{1}{5}\left(\dfrac{1}{2}-\dfrac{1}{3}\right):\left(\dfrac{-9}{10}\right)+\dfrac{-7}{3}=\dfrac{1}{5}\cdot\dfrac{1}{6}:\left(-\dfrac{97}{30}\right)=\dfrac{1}{30}:\left(-\dfrac{97}{30}\right)=-\dfrac{1}{97}\)
\(e)\dfrac{-7}{8}\div\dfrac{21}{16}-\dfrac{5}{3}\times\left(\dfrac{1}{5}-\dfrac{7}{10}\right)\)
\(=\dfrac{-7}{8}\div\dfrac{21}{16}-\dfrac{5}{3}\times\left(\dfrac{-1}{2}\right)\)
\(=\left(\dfrac{-2}{3}\right)-\dfrac{5}{3}\times\left(\dfrac{-1}{2}\right)\)
\(=\left(\dfrac{-2}{3}\right)-\dfrac{-5}{6}\)
\(=\dfrac{1}{6}\)
\(f)\dfrac{1}{5}\left(\dfrac{1}{2}-\dfrac{1}{3}\right)\div\left(\dfrac{-9}{10}\right)+\left(\dfrac{-7}{3}\right)\)
\(=\dfrac{1}{5}\times\dfrac{1}{6}\div\left(\dfrac{-9}{10}\right)+\left(\dfrac{-7}{3}\right)\)
\(=\dfrac{1}{30}\div\left(\dfrac{-9}{10}\right)+\left(\dfrac{-7}{3}\right)\)
\(=\left(\dfrac{-1}{27}\right)+\left(\dfrac{-7}{3}\right)\)
\(=\dfrac{-64}{27}\)
=−78÷2116−53×(−12)=−78÷2116−53×(−12)
f)15(12−13)÷(−910)+(−73)f)15(12−13)÷(−910)+(−73)
=130÷(−910)+(−73)=130÷(−910)+(−73)
=−6427
Trả Lời Câu Hỏi
e) 15(12−13):(−910)+−73=15⋅16:(−9730)=130:(−9730)=−19715(12−13):(−910)+−73=15⋅16:(−9730)=130:(−9730)=−197
