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 7/15

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.