Question

1 , tính 

12/17 ; 4          12 ; 6/13           9 ; 3/5 x 4/15

chú ý 

/ là phần     ; là dấu chia

Answer 1

12,7:4 = 3,175 ; 12:6,13 = 1,957585644 ; 9:3,5*4,15 = 10,67142857

Answer 2

12/17 : 4 = 12/17 * 1/4 = 12/68 = 6/34

12 : 6/13 = 12/1 * 13/6 = 156/6 = 26

9 : 3/5 * 4/15 = 9/1 * 5/3 * 4/15 = 15/1 * 4/15 = 60/15 = 4

Answer 3

Câu 1 là : 12/17:4=12/17:4/1=12/17*1/4=12/68=3/17

Câu 2 là : 12:6/13=12/1:6/13=12/1*13/6=156/6=26

Câu 3 là : 9:3/5*4/15=9/1:3/5=9/1*5/3=27/25*4/15=36/25