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6a) 1/6
6b)3/2
6c)5/4
7a)1/6
7b)7/6
7c)-3/10
1/5.(5/6)=5/30 ->1/6
b) 1/10:(2/3-3/5)
1/10:(1/15)=15/10->3/2
c) (2/3-1/2):(1/3-1/5)
(1/6):(2/15)=15/12->5/4
7) a) 1/6-5/3.(1/2-2/5)
-9/6.(1/10)=-9/60->-3/20
b) 2-5/6:(1/2+2/3)
7/6:7/6=42/42->1
c) 9/10-2/5:(1/2+1/6)
1/2:2/3=2/6->1/3
8) A) (1-3/4):(2+1/3)
1/4:7/3=7/12
b) 3/5:1/4=3/20
c) (3.1/2):(8:2/3)
3/2:12/1=3/24->1/8