Question

Найдите значения выражений ДАЮ 50 БАЛЛОВ СРОЧНО ​

Answer 1

$\frac{ {(a + b)}^{2} - 1}{ {a}^{2} - 1} \\ \\ a = - 3 \\ b = - 1 \\ \\ \frac{ {( - 3 - 1)}^{2} - 1 }{ {( - 3)}^{2} - 1} = \frac{16 - 1}{9 - 1} = \\ = \frac{15}{8} = 1 \frac{7}{8}$

$\frac{2 {a}^{2} - b}{ {b}^{2} + 1} - \frac{1}{a} \\ \\ a = 1 \frac{1}{2} = \frac{3}{2} \\ b = 0.5 = \frac{1}{2} \\ \\ \frac{2 {( \frac{3}{2}) }^{2} - \frac{1}{2} }{ {( \frac{1}{2} )}^{2} + 1} - \frac{1}{ \frac{3}{2} } = \\ = \frac{2 \times \frac{9}{4} - \frac{1}{2} }{ \frac{1}{4} + 1 } - \frac{2}{3} = \\ = \frac{ \frac{9}{2} - \frac{1}{2} }{ 1\frac{1}{4} } - \frac{2}{3} = \frac{4}{ \frac{5}{4} } - \frac{2}{3} = \\ = \frac{16}{5} - \frac{2}{3} = \frac{16 \times 3 - 2 \times 5}{15} = \\ = \frac{38}{15} = 2 \frac{8}{15}$

Answer 2

1) = -15/8 ,а это -1 целая 7/8 или -1,875
2)= -2