Tentukan hasil dari penjumlahan dan penguranngan berikut!!!!!!!

3 a. 2/15 - 1/2 = 4/30 - 15/30 = dibalik ajaa bisa = 11/30
11/30 + 3/10 = 11/30 + 9/30 = 20/30 diperkecil jadi 2/3

b. 3/7 + 4/21 = 9/21 + 4/21 = 13/21
13/21 - 13/14 = 26/42 - 39/42 = dibalik bisaa = 13/42

c. 4 2/5 - 1 1/3 = 22/5 - 4/3 = 66/15 - 20/15 = 46/15
46/15 + 2 3/4 = 46/15 + 11/4 = 184/60 + 165/60 = 349/60

d. 10 1/4 + 1 2/3 = 41/4 + 5/3 = 123/12 + 20/12 = 143/12
143/12 + 20 7/8 = 143/12 + 167/8 = 286/24 + 501/24 = 787/24

e. 2,25 + 25% = 225% + 25% = 250%
250% + 1 1/2 = 250% + 3/2 = 250% + 150% = 400% / 400/100 diperkecil menjadi 4/1