помогите даю 20балов...
[tex]( \frac{a - 1}{a + 1} - \frac{a + 1}{a - 1} ) \div \frac{2a}{1 - {a}^{2} } = [/tex]
[tex]( \frac{ {b}^{3} }{ {b}^{2} - 8b + 16 } - \frac{ {b}^{2} }{b - 4} ) \div ( \frac{ {b}^{2} }{8 - 16} - \frac{b}{b - 4} ) = [/tex]
[tex]( \frac{a - 1}{a + 1} - \frac{a + 1}{a - 1} ) \div \frac{2a}{1 - {a}^{2} } = [/tex]
[tex]( \frac{ {b}^{3} }{ {b}^{2} - 8b + 16 } - \frac{ {b}^{2} }{b - 4} ) \div ( \frac{ {b}^{2} }{8 - 16} - \frac{b}{b - 4} ) = [/tex]
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