Выполни действия: а)3+8 5/12 б)10 6/7-3 в)4 2/13+5 7/13 г)8 7/12-4 2/12 д)4 8/11+5 7/11 е)7 5/9-2 8/9 ж)7-3/8 з)10-3

Вычислим значения выражений: 

а) 3 + 8 5/12 = 3 + 8 + 5/12 = 11 + 5/12 = 11 5/12; 

б) 10 6/7 - 3 = 10 + 6/7 - 3 = 7 + 6/7 = 7 6/7; 

в) 4 2/13 + 5 7/13 = 4 + 2/13 + 5 + 7/13 = 9 + 2/13 + 7/13 = 9 + 9/13 = 9 9/13; 

г) 8 7/12 - 4 2/12 = 8 + 7/12 - 4 - 2/12 = 4 + 7/12 -  2 /12 = 4 + (7-2)/12 = 4 + 5/12 = 4 5/12;

д) 4 8/11 + 5 7/11 = 4 + 8/11 + 5 + 7/11 = 9 + 8/11 + 7/11 = 9 + 15/11 = 9 + 11/1 + 4/11 = 10 + 4/11 = 10 4/11; 

е) 7 5/9 - 2 8/9 = 7 + 5/9 - 2  - 8/9 = 5 + 5/9 - 8/9 = 5 - 3/9 = 5 - 1/3 = 4 + 2/3 = 4 2/3; 

ж) 7 - 3/8 = 6 + 8/8 - 3/8 = 6 5/8; 

з) 10 - 3 7/15 = 10 - 3 - 7/15 = 7 - 7/15 = 6 + 8/15 = 6 8/15.