РЕШИТЕ ПОЖАЛУЙСТА даю 20баллов
1)
[tex] \frac{ \frac { {a}^{2} }{a + b} - \frac{ {a}^{3} }{ {a}^{2} + 2ab + {b}^{2} } }{ \frac{a}{a + b} - \frac{ {a}^{2} }{ {a}^{2} - {b}^{2} } } [/tex]
2)
[tex] \frac{z - 2}{4 {z}^{2} + 16z + 16 } \div ( \frac{z}{2z - 4} - \frac{ {z}^{2} + 4}{2 {z}^{2} - 8 } - \frac{2}{ {z}^{2} + 2z} )[/tex]
3)
[tex] \frac{ \frac{2}{x} - \frac{x - 2}{ {x }^{2} - x} }{ \frac{3}{x} + \frac{x + 3}{ {x}^{2} - x } } [/tex]
4)
[tex]( \frac{a + 5}{5a - 1} + \frac{a + 5}{a + 1} ) \div \frac{ {a}^{2} + 5a }{1 - 5a} + \frac{ {a}^{2} + 5}{a + 1} [/tex]
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