Question

$\frac{3a - 7}{2a + 5}$
при а = -2; - 0,4; 0; 2,5;​

Answer 1

Объяснение:

при а= -2

$\frac{3 ( - 2) - 7}{2 ( - 2) + 5} = \frac{ - 6 - 7}{ -4 + 5 } = \frac{ - 13}{1} = - 13$

при а = -0.4

$\frac{3( - 0.4) - 7}{2( - 0.4) + 5} = \frac{ - 1.2 - 7}{ - 0.8 + 5} = \frac{ - 8.2}{4.2} = \frac{ - \frac{41}{5} }{ \frac{21}{5} } = - \frac{41}{21} = - 1 \frac{20}{21}$

при а = 0

$\frac{3 \times 0 - 7}{2 \times 0 + 5} = - \frac{7}{5} = - 1 \frac{2}{5}$

при а = 2.5

$\frac{3 \times 2.5 - 7}{2 \times 2.5 + 5} = \frac{7.5 - 7}{5 + 5} = \frac{0.5}{10} = 0.05$