Для ВУЗа :DПлиз хелп!

Решите задачу:

$( \frac{ay+1}{(y-1)(y+1)} - \frac{a}{y-1} )+ \frac{a}{y(y+1)} : \frac{1}{y(y+1)} = \\ \\ \frac{ay+1-a(y+1)}{y(y-1)(y+1)}+ \frac{a}{y(y+1)} * \frac{y(y+1)}{1} = \\ \\ \frac{ay+1-ay-1}{(y-1)(y+1)} +a=0+a=a \\ \\$

$( \frac{ x^{ \frac{5}{12} } }{ x^{ \frac{1}{3} } } + \frac{ x^{ \frac{1}{4} } }{ x^{ \frac{1}{6} } } )* x^{- \frac{1}{12} } = \\ \\ ( \frac{ x^{ \frac{5}{12} } }{ x^{ \frac{1}{3} } } )* x^{ -\frac{1}{12} } +( \frac{ x^{ \frac{1}{4} } }{ x^{ \frac{1}{6} } } )* x^{- \frac{1}{12} } = \\ \\ (\frac{ x^{ \frac{4}{12} } }{ x^{ \frac{1}{3} } } )+( \frac{ x^{ \frac{2}{12} } }{ x^{ \frac{1}{6} } } )= \\ \\ \frac{ x^{ \frac{1}{3} } }{ x^{ \frac{1}{3} } } + \frac{ x^{ \frac{1}{6} } }{ x^{ \frac{1}{6} } } =1+1=2$