1. a) -a – (b – a – c) b) -(a – c) – (a – b + c) c) b – (b + a + c) d) -(a – b + c) – (a + b + c)

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1. Đáp án:

    

   Giải thích các bước giải:

   `a) -a – (b – a – c)`

   `= -a-b+a+c`

   `= c-b`

   `b) -(a – c) – (a – b + c)`

   `= -a+c-a+b-c`

   `= -2a+b`

   `c) b – (b + a + c)`

   `= b-b-a-c`

   `= -a-c`

   `d) -(a – b + c) – (a + b + c)`

   `= -a+b-c-a-b-c`

   `= -2a-2c`

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2. Đáp án:

    a, `-a – (b – a – c)`

   `= -a – b + a + c`

   `=(-a + a) + c – b`

   `= c – b`

   b, `-(a – c) – (a – b + c)`

   `= -a + c – a + b – c`

   `=(-a – a) + ( c – c) + b`

   `= -2a + b`

   c, `b – (b + a + c)`

   `= b – b – a – c`

   `=( b – b) – a – c`

   `=-a – c`

   d, `-(a – b + c) – (a + b + c)`

   ` = -a + b – c – a – b – c`

   ` = (-a – a) + (b – b) – (c + c)`

   ` = -2a – 2c`

    

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