Question

a,7/3.-5/2.15/21..4/-5

cac ban giai chi tiet cho minh nha 

 

 

Answer 1

tham khảo

Answer 2

\(\dfrac{7}{3}.\dfrac{-5}{2}.\dfrac{15}{21}.\dfrac{-4}{5}=-\dfrac{46}{630}=-\dfrac{23}{315}\)

Answer 3

\(\dfrac{7}{3}x\dfrac{-5}{2}x\dfrac{15}{21}x\dfrac{4}{-5}\)

\(=\dfrac{7}{3}x\dfrac{-5}{2}x\dfrac{5}{7}x\dfrac{4}{-5}\)

\(=\dfrac{7x\left(-5\right)x5x4}{3x2x7x\left(-5\right)}\)

=\(=\dfrac{10}{3}\)