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d=20/9:10/3
d=20/9x3/10
d=2/3
spr.3 1/3x2/3=10/3x2/3=20/9=2 2/9
e)
e:5=1/2
e=1/2x5
e=5/2
spr.5/2:5=5/2x1/5=1/2
f)
2,1:f=0,2
f=2,1:0,2
f=10,5
spr.2,1:10,5=0,2