1. 2,8 ; 1,5
2. 195 мин.
3. а) 1/12 + 3/4 = 1/12 + 9/12 = 10/12 = 5/6
б) 3 1/2 + 1/3 = 3 3/6 + 2/3 = 3 5/6
4. а) 2/3 - 1/5 = 10/15 - 3/15 = 7/15
б) 1 1/5 - 3/4 = 1 4/20 - 15/20 = 9/20
5. 3 - (1 3/5 + 3/10) = 3 - ( 1 6/10 + 3/10) = 1 1/10 (л)
6. 1/4 + 7/12 + 1 1/3 - (1 1/6 - 1/2) = 3/12 + 7/12 + 1 4/12 - (1 1/6 - 3/6) = 2 1/6 - 4/6 = 1 3/6 = 1 1/2 = 1,5
7. 3 3/5 + ( 1 1/10*2 + 3 3/5 *2 ) = 9 4/10 ( м )