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Название: Short-Cut Math
Автор: Kelly G.
Clear, concise compendium of about 150 time-saving math short-cuts features faster, easier ways to add, subtract, multiply, and divide. Each problem includes an explanation of the method, a step-by-step solution, the short-cut solution, and proof, as well as an explanation of why it works. No special math ability needed.
Read more at http://ebookee.org/Short-Cut-Math_260555.html#rjPmH51OL0P96F84.99