11-6 13/21-3/14 по действиям

11-6 13/21-3/14=4 целых 1/6 1) 11-6 13/21=11-139/21=11*21/21-139/21=231/21-139/21=92/21 2) 92/21-3/14=92*2/42 - 3*3/42=184/42-9/42=175/42=4 7/42=4 1/6

1. 11-6 целых и 13/21 = (11*21-(6*21+13)) / 21 = (231-126-13)/21 = 92/21 2. 92/21-3/14 = (92*2-3*3)/42 = (184-9)/14 = 175/42 = 4 целых и 1/6