Вычислим значения степеней:

1. a) $$25^2 = 25 \times 25 = 625$$
2. б) $$8^4 = 8 \times 8 \times 8 \times 8 = 4096$$
3. в) $$7^3 = 7 \times 7 \times 7 = 343$$
4. г) $$7^5 = 7 \times 7 \times 7 \times 7 \times 7 = 16807$$
5. д) $$(-0,9)^3 = -0,9 \times -0,9 \times -0,9 = -0,729$$
6. e) $$(-2,4)^2 = -2,4 \times -2,4 = 5,76$$
7. ж) $$\left(-\frac{1}{2}\right)^5 = -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} = -\frac{1}{32} = -0,03125$$
8. з) $$\left(-\frac{1}{2}\right)^6 = -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} = \frac{1}{64} = 0,015625$$
9. и) $$-0,9^3 = -(0,9 \times 0,9 \times 0,9) = -0,729$$
10. к) $$-2,4^2 = -(2,4 \times 2,4) = -5,76$$