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a+17,2 =36
a=36-17,2
a=18,8
spr. 18,8+17,2=36
36=36
b)2 1/2 -b = 1 1/3
-b= 1 1/3 - 2 1/2
-b=1 2/6 - 2 3/6
-b= - 1 1/6
b= 1 1/6
spr.2 3/6 - 1 1/6 = 1 2/6
1 2/6 = 1 2/6
c) c -4,2 = 6 1/2
c -4,2=6,5
c= 6,5+4,2
c=10,7
spr. 10,7 - 4,2= 6,5
6,5=6,5
f)2,1:0,2=10,5
f=10,5
spr. 2,1: 10,5=0,2
0,2=0,2