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а) (7/15+7/30+4/5)/(2-1/3-1/2)=
б) (1/6+1/10+1/15)/(3/5-1/3-1/4)=
а) (7/15+7/30+4/5)/(2-1/3-1/2)=
б) (1/6+1/10+1/15)/(3/5-1/3-1/4)=
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б) = (5/30+3/30+ 2/30)/ (36/60-20/30-15/60)=(10/30) /(1/60)=10/30 х 60/1 = 10/1 х 2/1 = 20