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11. 4 12. 1 х II ICO 6 3 12 х 7 12 II 13. 14. X II 21 x Х

11. 4 12. 1 х II ICO 6 3 12 х 7 12 II 13. 14. X II 21 x Х-example-1
User Tamtam
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3(6)/(12)+(7)/(12)=3(6+7)/(12)
=3(13)/(12)=(3+1)(1)/(12)=4(1)/(12)

User Andrey Rubshtein
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