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30 2.5 ./1 = 75
2 4 = 8
75 8 = 67 .
67 : 3 = 22 ( )
2 22 . , 2 (22: 2 = 11 ) 11 . . ! . .
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https://www.passionforum.ru/posts/123239-kak-rasschitat-bystro-i-prosto-reglan-dlja-rebenka-do-10-let.html