a)-1/4+2/3-7/12 b)1/2020.5/19+1/2020.17/19-1/2020.3/19

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1. a, `-1/4` + `2/3` – `7/12`

   ⇔ `-3/12` + `8/12` – `7/12`

   ⇔ `{-3 + 8 -7}/12`

   ⇔ `-2/12`

   ⇔ `-1/6`

   b, `1/2020` . `5/19` + `1/2020` . `17/19` – `1/2020` . `3/19`

   ⇔ `1/2020` . ( `5/19` + `17/19` – `3/19` )

   ⇔ `1/2020 .  `19/19`

   ⇔ `1/2020` . `1`

   ⇔ `1/2020`

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2. a) `-1/4 + 2/3 – 7/12`

   `= -3/12 + 8/12 – 7/12`

   `= (-3 +8 -7)/12`

   `=-2/12`

   `= -1/6`

   b) `1/2020 . 5/19 + 1/2020 . 17/19 – 1/2020. 3/19`

   `= 1/2020 ( 5/19 + 17/19 – 3/19)`

   `= 1/2020 . 19/19`

   `=1/2020 .1`

   `=1/2020`

    

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