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2. 2 2/3-6/10=2 20/30-18/30=2 2/30*1/4=2/30*1/4=1/120-1/4=
2.(2 2/3-0,6)*0,25-1/4=(8/3-6/10)*1/4-1/4=(80/30-18/30)*1/4-1/4=62/30*1/4-1/4=62/120-1/4=31/60-1/4=31/60-15/60=16/60=4/15