tính nhanh a, 72,99 – 41,09 – 21,90 b, 7/4+17/3+5/4+4/3

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1. `a)` `72,99` `-` `41,09` `-` `21,90`

   `=` `72,99` `-` `21,90` `-` `41,09`

   `=` `51,09` `-` `41,09`

   `=` `10`

   `b)` `7/4` `+` `17/3` `+` `5/4` `+` `4/3`

   `=` `(` `7/4` + `5/4` `)` `+` `(` `17/3` `+` `4/3` `)`

   `=` `12/4` + `21/3`

   `=` `3` `+` `7`

   `=` `10`

   Trả lời

2. a) 72,99 – 41,09 – 21,90

   = 72,99 – ( 41,09 + 21,90)

   =10

   b) 7/4+17/3+5/4+4/3

   =(7/4+5/4)+(17/3+4/3)

   =12/4+21/3

   =36/12+84/12

   = 120/12=10

   Chúc bạn học tốt nhé!

   Cho mk xin vote 5* nha 

    

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