1. Ртр=? а) 2 1/9 дм б) 2 4/9 дм в) 4 2/9 дм
Р=2 1/9+2 4/9+4 2/9=8 7/9 дм
2. 6 1/7 + 7 1/8= 13 (8/56+7/56)= 13 15/56
3. 1 4/7 + 5 3/8= 6 (32/56+21/56)= 6 53/56
4. у- 5 5/6= 11 5/12
у= 11 5/12 +5 5/6= 16 (5/12+ 10/12)= 16 15/12=
=17 3/12= 17 1/4
17 1/4 - 5 5/6= 11 (15/12-10/12)= 11 5/12
11 5/12=11 5/12
5.а) 1 1/3+3 1/2=4 (2/6+3/6)= 4 5/6
б) 2 1/3+3 1/5= 5 (5/15+3/15)= 5 8/15
в) 1 4/5+4 1/7= 5 ( 28/35×7/35)= 5 35/35=6
г) 1 2/7 + 4 1/9= 5 (18/63+7/63)= 5 25/63.