Bài 1 : Tính bằng hai cách a) (5/4+2/5):5/6 b) 3/4×2/5-3/4*2/7 c) 2/3 : (5/6×9/10

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1. a) (5/4 + 2/5) ÷ 5/6

   C1:

   = 33/20 ÷ 5/6

   = 99/50

   C2 :

   = 5/4 + 2/5 ÷ 5/6

   = 5/4 + 12/25

   = 173/100

   b) 3/4 x 2/5 – 3/4 x 2/7

   C1:

   = 3/10 – 3/14

   = 3/35

   C2:

   = 3/4 x (2/5 – 2/7)

   = 3/4 x 4/35

   = 3/35

   c) 2/3 ÷ (5/6 x 9/10)

   C1 :

   = 2/3 ÷ 3/4

   = 8/9

   C2 :

   = 2/3 ÷ 5/6 x 9/10

   = 4/5 x 9/10

   = 18/25

   Chúc em học tốt !

   Cho cj xin câu trlhn nhé

    

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2. $#Dino$

   a) `C1`

   `(5/4+2/5):5/6`

   `=33/20:5/6`

   `=99/50`

   `C2`

   `(5/4+2/5):5/6`

   `=5/4xx6/5+2/5xx6/5`

   `=3/2+12/25`

   `=99/50`

   ……………………………

   `b) C1`

   `3/4xx2/5-3/4xx2/7`

   `=3/10-3/14`

   `=3/35`

   `C2`

   `3/4xx2/5-3/4xx2/7`

   `=3/4xx(2/5-2/7)`

   `=3/4xx4/35`

   `=3/35`

   …………………………….

   `c) 2/3:(5/6xx9/10)`

   `=3/2xx3/4`

   `=9/8`

   `C2`

   `2/3:(5/6xx9/10)`

   `=2/3:5/6xx9/10`

   `=2/3xx6/5xx9/10`

   `=9/8`

    

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