bài1: a)11+99-48 b) 33-25+62-27 c)43-27+68-43+92

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1. `a)11+99-48`

   `=110-48`

   `=62`

   `b) 33-25+62-27`

   `=8+62-27`

   `=70-27`

   `=43`

   `c)43-27+68-43+92`

   `=(43-43)+(68+92)-27`

   `=0+160-27`

   `=133`

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2. Bài 1:

   `a) 11 + 99 – 48`

   `= 110 – 48 `

   `= 62`

   `b ) 33 – 25 + 62 -27`

   `= 8 + 35`

   `= 43`

   `c) 43 – 27 + 68 – 43 +92`

   `= 16 + 25 +92`

   `= 41 + 92`

   `= 133`

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