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1/3-0,1=1/3-1/10=10/30-3/30=7/30
1 i 1/3·2=4/3·2=8/3=2 i 2/3
5 i 10/11:5=65/11·1/5=13/11=1 i 2/11
(1/2)³=1/2·1/2·1/2=1/8