906. Қимати ифодаро ҳисоб кунед: a)-10-2; б) (-2)-3; в) (-0,7)-2; г) (0,4)-5; д) -(-2)-3; в) -(-4)-2.

906. Ҳисоблаймиз:

1. a)

   \[ -10^{-2} = -\frac{1}{10^2} = -\frac{1}{100} = -0.01 \]

2. б)

   \[ (-2)^{-3} = \frac{1}{(-2)^3} = \frac{1}{-8} = -0.125 \]

3. в)

   \[ (-0.7)^{-2} = \frac{1}{(-0.7)^2} = \frac{1}{0.49} = \frac{100}{49} \approx 2.04 \]

4. г)

   \[ (0.4)^{-5} = \left(\frac{4}{10}\right)^{-5} = \left(\frac{2}{5}\right)^{-5} = \left(\frac{5}{2}\right)^5 = \frac{3125}{32} = 97.65625 \]

5. д)

   \[ -(-2)^{-3} = -\left(\frac{1}{(-2)^3}\right) = -\left(\frac{1}{-8}\right) = \frac{1}{8} = 0.125 \]

6. е)

   \[ -(-4)^{-2} = -\left(\frac{1}{(-4)^2}\right) = -\left(\frac{1}{16}\right) = -\frac{1}{16} = -0.0625 \]