1) 8 2/3-(-4 3/8)=8 2/3+4 3/8=8 16/24+4 9/24=12 25/24=13 1/24
-6 1/36-3=-9 1/36
13 1/24+(-9 1/36)=13 3/72-9 2/72=4 1/72
2) 3 4/21-5 1/12=3 4/21-4 13/12=3 16/84-4 91/84=-1 75/84=-1 25/28
-1 25/28-(-4 5/14)=-1 25/28+4 5/14=-1 25/28+3 19/14=-1 25/28+3 38/28=
=2 13/28
1)Нок(15;20)=60
(20+20+20=60 60:15=4)
2)Нок(65;52)=5*2*2*13=260
65=5*13
52=2*2*13
8м-800см
4дм-40см
5см+6дм=65см