December 2018 1 278 Report

1.Aratati ca numarul a=  \sqrt{1+3+5+.....+99} este rational
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2. a)  \frac{[(12 \frac{1}{12}+ \frac{1}{10} + \frac{4}{5} ): \frac{1}{15} -6: \frac{1}{28} ]x \frac{1}{4} }{(5x2 \frac{2}{5} -8 \frac{3}{22} ):42 \frac{1}{2} }

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