Tolong jawab sekarang juga soalnya mau dikumpulin besok!!! Tolong yaaa...

a. 2/15 - 1/2 + 3/10 =
20/150 - 75/150 + 45/150 =
-55/150 + 45/150 =
-10/150 =
-1/15

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 =
22/5 - 4/3 + 11/4 =
264/60 - 80/60 + 165/60 =
184/60 + 165/60 =
349/60 = 5 49/60

Maaf klo salah..
Semoga membantu yah..