89,8:59 13/15+3/7-(42-41 36/49)*3.5
2 4 5 1 3 89,8:59 13/15 +3/7-(42-41 36/49)*3.5=4 19/70 1. 42 - 41 36/49 = 42/1−41 36/49=13/49 2. 89,8 : 59 13/15 = 1 1/2 3. 13/49 * 3,5 = 13/14 4. 1 1/2 +3,7 =5 1/5 5. 5 1/5 - 13/14 =4 19/70
спс