Question

Tính :  A = \(\frac{-5}{9}\times\frac{13}{28}-\frac{13}{28}\times\frac{4}{9}\)

Answer 1

\(A=\frac{13}{28}\left(-\frac{5}{9}-\frac{4}{9}\right)=\frac{13}{28}\left(-\frac{9}{9}\right)=\frac{13}{28}\left(-1\right)\)

=> \(A=-\frac{13}{28}\)

Answer 2

A= -5/9x 13/28- 13/28x 4/9

  =13/28x (-5/9- 4/9)

  =13/28x (-1)

  =-13/28

Answer 3

A=(-5/9-4/9)*13/28

A=-1*13/28

A=-13/28

Answer 4

Tính theo cách hợp lý:A=(\(\frac{-5}{9}\)-\(\frac{13}{28}\)).\(\frac{13}{28}\)=\(\frac{-13}{28}\)