/-это дробная черта говорю взорание (1/13+1/14):(1/13-1/14)x(1/27)=

[latex]( \frac{1}{13} + \frac{1}{14} ) : ( \frac{1}{13} - \frac{1}{14} ) * \frac{1}{27} = \\ \\ = ( \frac{14+13}{182} ) : ( \frac{14-13}{182} ) * \frac{1}{27} = \\ \\ = \frac{27}{182} * \frac{182}{1} * \frac{1}{27} = 1[/latex]