1)=4/12 - 21/8+3 11/13=4/12 - 21/8 + 33/13=-715/312 + 792/312=77
2)4/6 + 28/24 : 8/5 - 3/8=32/48 + 35/48 - 18/48= 61/48
1)=4/12 - 21/8+3 11/13=4/12 - 21/8 + 33/13=-715/312 + 792/312=77
2)4/6 + 28/24 : 8/5 - 3/8=32/48 + 35/48 - 18/48= 61/48