Tolong ya please pake cara.... tolong bantu aku ini penting banget.

2/15-1/2+3/10
2-1=1
15-2=13

1+3=4
13+10=23
jdi,4/23

kalau salah mff

a. 2/15 - 1/2 + 2/10 =
4/30 - 15/30 + 6/30 =
- 11/30 + 6/30 =
- 17/30

b. 3/7 + 4/21 - 13/14 =
18/42 + 8/42 - 39/42 =
26/42 - 39/42 =
- 13/42

c. 4 2/5 - 1 1/3 + 2 3/4 =
(4 - 1 + 2) (2/5 - 1/3 + 3/4) =
5 (24/60 - 20/60 + 45/60) =
5 49/60

d. 10 1/4 + 1 2/3 + 20 7/8 =
(10 + 1 + 20) (1/4 + 2/3 + 7/8) =
31 (6/24 + 16/24 + 21/24) =
31 43/24

e. 2,25 + 25% + 1 1/2 =
2,25 + 0,25 + 1,5 =
2,5 + 1,5 =
4

Maaf kalau salah:)