3/4 – [(-3/5)-(1/12 + 2/9) – (-2/9 – 5/3)] Giúp mk với

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1. Đáp án:

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   `3/4 – [(-3/5) – (1/12 + 2/9) – (-2/9 – 5/3)]`

   `= 3/4 – [(-3)/5 – 1/12 – 2/9 + 2/9 + 5/3]`

   `= 3/4 – [ (-3/5 + 5/3) – 1/12 + (-2/9 + 2/9)]`

   `= 3/4 – [ (-9/15 + 25/15) – 1/12 + 0]`

   `= 3/4 – [16/15 – 1/12]`

   `= 3/4 – 16/15 + 1/12`

   `= (3/4 + 1/12) – 16/15`

   `= (9/12 + 1/12) – 16/15`

   `= 5/6 – 16/15`

   `= 25/30 – 32/30`

   `= (-7)/30`

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2. `3/4 – [(-3)/5 – (1/12 + 2/9) – ((-2)/9 – 5/3)]`

   `= 3/4 – ((-3)/5 – 1/12 – 2/9 + 2/9 + 5/3)`

   `= 3/4 + 3/5 + 1/12 + 2/9 – 2/9 – 5/3`

   `= (3/4 + 3/5 + 1/12 – 5/3) + (2/9 – 2/9)`

   `= (45/60 + 36/60 + 5/60 – 100/60) + 0`

   `= (45 + 36 + 5 – 100)/60`

   `= (-14)/60`

   `= (-7)/30`

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