Tính: a) $\dfrac{11}{15}$ + $\dfrac{-17}{25}$ b) $\dfrac{5}{12}$ – ($\dfrac{8}{15}$ + $\dfrac{5}{12}$)

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1. a) 11/15 + (-17/25)

   = 110/150 + (-102/150)

   = 4/75

   b) 5/12 – (8/15 + 5/12)

   = 5/12 – 19/20

   = -8/15

   Trả lời

2. a) `11/15` `+` `-17/25`

   `=` `275/375` `+` `-255/375`

   `=` `20/375`

   `=` `4/75`

   b) `5/12` `-` ( `8/15` `+` `5/12` )

   `=` `5/12` `-` `19/20`

   `=` `-8/15`

    

   Trả lời