а) [tex]( \frac{2-a}{2+a} - \frac{a+2}{a-2}) : ( \frac{2+a}{2-a} + \frac{a-2}{a+2}) [/tex]

б) [tex] (\frac{m^2}{m-n} + \frac{m^2n}{m^2-2mn+n^2}) : ( \frac{2m^2}{m^2-n^2} - \frac{m}{m+n}) [/tex]

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