1) -7/12 – 11/-24 2) 8/40 – 36/45 3 ) 7/9 +5/12 – 3/4

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1. Đáp án:

    —

   Giải thích các bước giải:

    1)

   `-7/12` – `11/-24`

   =`-7/12` – `-11/24`

   =`-14/24` – `-11/24`

   =`-3/24`

   =`-1/8`

    2)

   `8/40` – `36/45`

   =`1/5` – `4/5`

   =`-3/5`

    3)

   `7/9` + `5/12` – `3/4`

   =`7/9` + `5/12` – `9/12`

   =`7/9` – `3/9`

   =`4/9`

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2. `1 ) (-7)/12 – 11/-24`

   `= (-14)/24 – (-11)/24`

   `= ( – 3 )/24 = ( – 1 )/8`

   `2 ) 8/40 – 36/45`

   `= 1/5 – 4/5`

   `= ( – 3 )/5`

   `3 ) 7/9 + 5/12 – 3/4`

   `= 28/36 + 15/36 – 27/36`

   `= 43/36 – 27/36`

   `= 16/36 = 4/9`

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