6 целых 3 восьмых+2целых 1 восьмая,3 целых 6/13+3целых 5/13,9целых 3/5+3целых1/5,4 целых7/8+6целых1/8,5целых1/3+1целых1/3,1целых3/8+2целых5/8,7целых3/10+2целых

1) 6 3/8 + 2 1/8 = 6 + 2 + (3 + 1)/8 = 8 + 4/8 = 8 + 4/(4 * 2) = 8 1/2;

2) 3 6/13 + 3 5/13 = 3 + 3 + (6 + 5)/13 = 6 + 11/13 = 6 11/13;

3) 9 3/5 + 3 1/5 = 9 + 3 + 3/5 + 1/5 = 12 + (3 + 1)/5 = 12 + 4/5 = 12 4/5;

4) 4 7/8 + 6 1/8 = 4 + 6 + 7/8 + 1/8 = 10 + (7 + 1)/8 = 10 + 8/8 = 10 + 1 = 11;

5) 5 1/3 + 1 1/3 = 5 + 1 + 1/3 + 1/3 = 6 + (1 + 1)/3 = 6 + 2/3 = 6 2/3;

6) 1 3/8 + 2 5/8 = 1 + 2 + 3/8 + 5/8 = 3 + (3 + 5)/8 = 3 + 8/8 = 3 + 1 = 4;

7) 7 3/10 + 2 7/10 = 7 + 2 + 3/10 + 7/10 = 9 + (3 + 7)/10 = 9 + 10/10 = 9 + 1 = 10.