Question

помогите пожалуйста помогите срочнооооо!!!​

Answer 1

$\frac{5a {}^{2} }{1 - {a}^{2} } \div (1 - \frac{1}{1 - a} ) = \frac{5a {}^{2} }{(1 - a)(1 + a) } \div \frac{1 - a - 1}{1 - a} = \frac{5a {}^{2}(1 - a) }{ - a(1 - a)(1 + a)} = \frac{5a}{ - (1 + a)} = \frac{5a}{ - 1 - a} = \frac{5 \times ( - 2)}{ - 1 - ( - 2)} = \frac{ - 10}{ - 1 + 2} = \frac{ - 10}{1} = - 10$

$\frac{a - {a}^{6} }{ {a}^{4} + {a}^{2} } \div \frac{ {a}^{7 }- a {}^{2} }{a {}^{5} + a } = \frac{a(1 - a {}^{5}) \times a (a {}^{4} + 1)}{a {}^{2} (a {}^{2} + 1) \times {a}^{2} ( {a}^{5} - 1) } = - \frac{a {}^{4} + 1}{a {}^{2} ( {a}^{2} + 1)} = - \frac{a {}^{4} + 1}{a {}^{4} + {a}^{2} } = - \frac{( - 2) {}^{4} + 1}{( - 2) {}^{ {}^{4} } + ( - 2) {}^{2} } = - \frac{ 16 + 1}{16 + 4} = - \frac{17 }{20} = - 0.85$