Question

Вычислите:
$(frac {7}{330} + frac{2}{495}): frac{5}{11}$

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Answer 1

$(frac {7}{330} + frac{2}{495}): frac{5}{11} =(frac {7}{330} + frac{2}{495})* frac{11}{5} = \ \ =frac {7}{330}* frac{11}{5} + frac{2}{495}* frac{11}{5} =frac {7}{30}* frac{1}{5} + frac{2}{45}* frac{1}{5} =(frac {7}{30} + frac{2}{45})* frac{1}{5} = \ \ =(frac {21}{90} + frac{4}{90})* frac{1}{5} =frac {25}{90}* frac{1}{5} =frac {5}{90}* frac{1}{1} =1/18$