3 + 2/5 4 – 5/7 1 [ 2 /5 + 1/3 ] nhanh nha :(

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1. 3+ 2/5= 3/1 + 2/5 = 15/5+ 2/5 = 17/5

   4- 5/7 = 4/1-5/7 = 28/7 – 5/7= 23/7

   1 ( 2/5 +1/3) = 1 ( 6/15+ 5/15) = 1. 11/15= 11/15

    

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2.   3 + `2/5` 

   = `3/1` + `2/5`

   = `15/5` + `2/5` 

   = `17/5`

      4 – `5/7` 

   = `4/1` – `5/7` 

   = `28/7` – `5/7` 

   = `23/7`

      1 x ( `2/5` + `1/3 )

   = 1 x ( `6/15` + `5/15`

   = 1 x `11/15` 

   = `11/15`

   Mik xin hay nhất ạ !

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