5/8 – 2/8, 6/18 x 6/24, 17/ 18: 5/6, 5/9-1/4 3: 2/7 5/6×5 4+21/17 9-4/11

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1. Đáp án:

   `5/8 – 2/8 = (5-2)/8 = 3/8`

   `6/18 × 6/24 = (6×6)/(18×24) = (\cancel6×\cancel6)/(\cancel18×\cancel24) = (1×1)/(3×4) = 1/12`

   `17/18 : 5/6 = 17/18 × 6/5 = (17×6)/(18×5) = (17×\cancel6)/(\cancel18×5) = (17 × 1 )/(3×5) = 17/15`

   ` 5/9-1/4 = 20/36 – 9/36 = (20-9)/36 = 11/36 `

   `3: 2/7 = (3 × 7)/2 = 21/2 `

   `5/(6×5) = \cancel5/(6×\cancel5) = 1/6`

   `4+21/17 = 68/17 + 21/17 = (68+21)/17 = 89/17`

   `9-4/11 = 99/11 – 4/11 = (99-4)/11 = 95/11`

   `Go od luck!`

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2. Đáp án:

    

   Giải thích các bước giải:

   `a, 5/8 – 2/8`

   `= (5 -2)/8 = 3/8`

   `b, 6/18 × 6/24`

   `= (6 × 6)/(18 × 24)`

   `= 1/12`

   `c, 17/ 18: 5/6`

   `= 17/18 × 6/5`

   `= 17/15`

   `d, 5/9-1/4`

   `= 20/36 – 9/36`

   `= 11/36`

   `e, 3: 2/7`

   `= 3 × 7/2`

   `= 21/2`

   `g, 5/6 × 5`

   `= (5 × 5)/6`

   `= 25/6`

   `i, 4+21/17`

   `= 68/17 + 21/17`

   `= 89/17`

   `h, 9-4/11`

   `= 99/11 – 4/11`

   `= 95/11`

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