Question

it is very important please sum all question

Answer 1

1.a. 5/7 + 3/28+ 1
   = 20/28 + 3/28 + 28/28
   = 51/28
   b. 3  1/2 + 2  1/4 + 3
   = 7/2 + 9/4 +3
   = 14/4 + 9/4 + 12/4
   = 35/4
   c. 10/15 + 12/20 + 2/5
   = 10/15 + 9/15 + 6/15
   = 25/15
   = 5/3
   d. 3  1/5 + 4  1/10 + 5  1/15
   = 16/15 + 41/10 + 76/15
   = 32/30 + 123/30 + 152/15
   = 307/30
   e. 1  3/8 + 1  2/3 + 1 5/12
   = 11/8 + 5/3 + 17/12
   = 33/24 +40/24 + 34/24
   = 107/24
   d. do this your self because if i do everything, there is no use.

2.a. 3 - 4/5
   = 15/5 -4/5
   = 11/5
   b. 6 - 2/3
   = 18/3 - 2/3
   = 16/3
   c. 5  2/3 - 1  1/3
   = 17/3 - 4/3
   =13/3
   d. 3  1/2 - 2  1/4
   = 7/2 - 9/4
   = 14/2 - 9/4
   = 5/3
   e. 3  3/5 - 1  1/15
   = 18/5 - 16/15
   = 54/15 - 16/15
   = 38/15
   f. 2  1/3 - 1  2/18
   = 7/3 - 20/18
   = 21/9 - 10/9
   = 11/9
   g. do it yourself

Answer 2

If you just want the sum only then better use your calculator for it.