the russian elemantary education on maths is quite famous:)
thx a lot!
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Codeforces Round 976 (Div. 2) and Divide By Zero 9.0
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Codeforces Round 976 (Div. 2) and Divide By Zero 9.0
16:09:02
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Try searching the MCCME Internet Library.
This book is a good example.
И правда, для детей от 5 до 15 лет.