Question

Answer 1

giải hộ câu 4 chi tiết nha

Answer 2

4: \(=\dfrac{9+28}{21}\cdot\dfrac{5\cdot14-4\cdot37}{37\cdot14}\)

\(=\dfrac{37}{21}\cdot\dfrac{70-148}{37\cdot14}\)

\(=\dfrac{-78}{21\cdot14}=\dfrac{-39}{21\cdot7}=\dfrac{-13}{7\cdot7}=\dfrac{-13}{49}\)

Answer 3

\(\left(\dfrac{3}{7}+\dfrac{4}{3}\right)\times\left(\dfrac{5}{37}-\dfrac{4}{14}\right)\)

=\(\left(\dfrac{9}{21}+\dfrac{28}{21}\right)\times\left(\dfrac{70}{518}-\dfrac{148}{518}\right)\)

=\(\dfrac{37}{21}\times \left(-\dfrac{38}{257}\right)\)

 

=\(-\dfrac{798}{5397}\)