Question

\(\dfrac{12}{19}\).\(\dfrac{7}{15}\).\(\dfrac{-13}{17}\).\(\dfrac{19}{12}\).\(\dfrac{17}{13}\)

Tính hợp lý :

Answer 1

`12/19 . 7/15 . (-13)/17 . 19/12 . 17/13`

`=(12/19 . 19/12) . ( (-13)/17 . 17/13) . 7/15`

`= 1 . (-1) . 7/15`

`= -1 . 7/15`

`=-7/15`

Answer 2

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Answer 3

`12/19 * 7/15 * (-13)/17 * 19/12 * 17/13`

`= (12/19 * 19/12)* ( (-13)/17 * 17/13) * 7/15`

`=1* (-1)* 7/15`

` = (-1) * 7/15 = -7/15`