tính a, 2/3 + 1/6 -1/2 b, 1/4 + 2/3 nhân 3/4 c,1/6 nhân 2/3 :2/9 d,7/8 -5/12 :5/6

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1. `text{Đáp án :}`

   `text{a)}` `2/3` + `1/6` – `1/2` = `12/18` + `3/18` – `9/18` = `15/18` – `9/18` = `6/18` = `1/3`

   `text{b)}` `1/4` + `2/3` x `3/4` = `1/4` + `1/2` = `1/4` + `2/4` = `3/4`

   `text{c)}` `1/6` x `2/3` : `2/9` = `2/18` : `2/9` = `2/18` x `9/2` = `18/36` = `1/2`

   `text{d)}` `7/8` – `5/12` : `5/6` = `7/8` – `5/12` x `6/5` = `7/8` – `30/60` = `7/8` – `3/6` = `42/48` – `24/48` = `18/48` = `3/8`

   `text{e)}` `1/2` x `2/3` x `3/5` = `2/6` x `3/5` = `6/30` = `1/5`

   `text{f)}` `1/2` : `2/3` : `3/5` = `1/2` x `3/2` x `5/3` = `3/4` x `5/3` = `15/12` = `5/4`

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2. Đáp án:

    

   Giải thích các bước giải:

    a) 2/3 + 1/6 -1/2=4/6+1/6-3/6

       =5/6-3/6

       =1/3

   b, 1/4 + 2/3 x 3/4

       =1/4+ 1/2

       =1/4 +2/4

       = 3/4

   c,1/6 x 2/3 :2/9

      =1/9:2/9

      =1/9×9/2

      =1/2

   d,7/8 -5/12 :5/6

      =7/8-1/2

      =7/8-4/8

      =3/8

   e, 1/2 x 2/3 x 3/5

       =1/3 x3/5

       =1/5

   f,1/2: 2/3 : 3/5

     =3/4 x 5/3

     =5/4

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