Question

bài 3: Tính: 

1) 1/6 - -5/6     2) 6/13 - -14/39     3) 4/5 - 4/-18     4) 7/21 - 9/-36

5)  -12/18 - -21/35     6) -3/21 - 6/42     7) -18/24 - 15/21     8) 1/6 - 2/5 

các bn giup mik mik vs 

Answer 1

1)1/6 - - 5/6 = 1/6 + 5/6 = 1

2)6/13 - -14/39 = 6/13 + 14/39= 32/39

3)4/5 - 4/-18 = 4/5 + 4/18= 46/45

4)7/21 - 9/-36 = 7/21 + 9/36 = 7/12

5)-12/18 - -21/35  = -12/18 + 21/35 = -1/15

6)-3/21 - 6/42 = -2/7

7)-18/24 - 15/21 = -41/28

8)1/6 - 2/5 =-7/30