`16/15`.`-5/24`.`54/24`.`56/21` `7/3`.`-5/2`.`15/21`.`4/-5` (-`5/9`).`3/23`+(`-13/18`).`3/23` `1/4`.(`-2/13`)-`7/24`.`2/13` `-2/3`.`3/11`+`-7/9`.`3/11

0 bình luận về “`16/15`.`-5/24`.`54/24`.`56/21` `7/3`.`-5/2`.`15/21`.`4/-5` (-`5/9`).`3/23`+(`-13/18`).`3/23` `1/4`.(`-2/13`)-`7/24`.`2/13` `-2/3`.`3/11`+`-7/9`.`3/11”

1. *Lời giải :

   16/15 . -5/24 . 54/24 . 56/21

   = 16 . -5 . 54 . 56/15 . 24 . 24 . 21

   = -4/3

   7/3 . -5/2 . 15/21 . 4/-5

   = 7 . -5 . 15 . 4/3 . 2 . 21 . -5

   = 10/3

   -5/9 . 3/23 + -13/18 . 3/23

   = 3/23 . (-5/9 + -13/18)

   = 3/23 . -23/18

   = -1/6

   -2/3 . 3/11 + -7/9 . 3/11 – 3/11

   = 3/11 . (-2/3 + -7/9 – 1)

   = 3/11 . -22/9

   = -2/3

   7/13 . 5/19 + 7/19 . 8/13 – 3 . 7/19

   = 7/13 . 5/19 + 7/19 . (8/13 – 3)

   = 7/13 . 5/19 + 7/19 . -31/13

   = 5/13 . 7/19 + 7/19 . -31/13

   = 7/19 . (5/13 + -31/13)

   = 7/19 . -2

   = -14/19

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2. Đáp án:

    

   Giải thích các bước giải:

    ` 16/15 . (-5)/24 . 54/24 . 56/21 `

   ` = -2/9 . 54/24 . 56/21 `

   ` = -1/2 . 56/21 `

   `=-4/3 `

   ` 7/3 . (-5)/2 . 15/21 . 4/(-5) `

   ` = -35/6 . 15/21 . 4/(-5) `

   `=-25/6 . 4/(-5) `

   `=10/3 `

   ` (-5/9) . 3/23 + ( – 13)/18 . 3/23 `

   `=-5/69 + (-13)/138 `

   `=-1/6 `

   ` 1/4 . (-2/13) – 7/24 . 2/13 `

   ` = -1/26 – 7/156 `

   `=-1/12 `

   ` -2/3 . 3/11 + (-7)/9 . 3/11 – 3/11 `

   ` = -2/3 . 3/11 + (-7)/9 . 3/11 – 3/11 . 1 `

   `= 3/11 . ( -2/3 + (-7)/9 + 1 ) `

   `= 3/11 . -4/9 `

   `=-4/33 `

   ` 7/13 . 5/19 + 7/19 . 8/13 – 3 . 7/19 `

   ` =  7/13 . 5/19 + 7/19 . ( 8/13 – 3 ) `

   `= 7/13 . 5/19 + 7/19 . -31/13 `

   ` = 35/247 + (-217)/247 `

   ` = -14/19 `

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