1) 1/72 - 1/99 = 11/792 - 8/792 = 3/792 Общий знаменатель 9*11*8 = 792)
2) 1:3/792 = 1*792/3 = 264
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1) 1/72 - 1/99 = 11/792 - 8/792 = 3/792 Общий знаменатель 9*11*8 = 792)
2) 1:3/792 = 1*792/3 = 264