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

Bởi

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

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  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`

     

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