9*2/(20*3)=18/60=0.3 вот и всё
(2/3)*(9/20)=(2/3)*9/20=6/20=0.3
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9*2/(20*3)=18/60=0.3 вот и всё
(2/3)*(9/20)=(2/3)*9/20=6/20=0.3