6 3/5-3 5/12; 9 1/2-4 7/18; 9 2/5-3 7/8; 8 2/3-2 5/7; 19 7/12+43 5/12; 7 7/15+4 11/12; 4 7/10+9 9/14

Определим значение следующих выражений. 6 3/5 - 3 5/12 = 33/5 - 41/12 = 396/60 - 205/60 = 191/60 = 3 11/60.9 1/2 - 4 7/18 = 19/2 - 79/18 = 171/18 - 79/18 = 92/18 = 46/9 = 5 1/9.9 2/5 - 3 7/8 = 47/5 - 31/8 = 376/40 - 155/40 = 221/40 = 5 1/40.8 2/3 - 2 5/7 = 26/3 - 19/7 = 182/21 - 57/21 = 125/21 = 5 20/21.19 7/12 + 43 5/12 = 235/12 + 521/12 = 756/12 = 63.7 7/15 + 4 11/12 = 112/15 + 59/12 = 448/60 + 295/60 = 743/60 = 12 23/60.4 7/10 + 9 9/14 = 47/10 + 135/14 = 329/70 + 675/70 = 1004/70 = 502/35 = 14 12/35.