Tính 5/14 + (-5)/7 + (-20)/41 + 8/13 + (-21)/41

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1. $\dfrac{5}{14} + (\dfrac{-5}{7}) + (\dfrac{-20}{41}) + \dfrac{8}{13} + (\dfrac{-21}{41})$

   $= (\dfrac{5}{14} + \dfrac{-5}{7}) + (\dfrac{-20}{41} – \dfrac{21}{41}) + \dfrac{8}{13}$

   $= (\dfrac{5}{14} + \dfrac{-10}{14}) + (-1) + \dfrac{8}{13}$

   $= \dfrac{-5}{14} -1 + \dfrac{8}{13}$

   $= \dfrac{-135}{182}$

    

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2. `5/14 + -5/7 + -20/41 + 8/13 + -21/41`

   `= ( 5/14 + -5/7 ) + ( -20/41 + -21/41 ) + 8/13`

   `= ( 5/14 + -10/14 ) + ( -1 ) + 8/13`

   `= -5/14 + ( -1 ) + 8/13`

   `= -65/182 + -182/182 + 112/182`

   `= -65/182 -182/182 + 112/182`

   `= -239/182`

   `HỌC` `TỐT` `NHA` `!`

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