Book (Practical) Mathematics A shortcut that mathematics finds

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Mathematics
Shincho Crest Books : "Double speed art of thinking" presented by a mathematician to you who are interested in "cost performance" and "Taipa". Add all integers from 1 to 100 -- a problem that the great mathematician Gauss solved in an instant at the age of nine -- is a little knack or shortcut, and you can easily get to the same answer. Spend more time with the saving art of thinking discovered by mathematics in its long history. A unique science essay that teaches you how to enjoy new life in the pandemic era.