a) $$25^2 = 25 \times 25 = 625$$
б) $$8^4 = 8 \times 8 \times 8 \times 8 = 4096$$
в) $$7^3 = 7 \times 7 \times 7 = 343$$
г) $$7^5 = 7 \times 7 \times 7 \times 7 \times 7 = 16807$$
д) $$(-0,9)^3 = (-0,9) \times (-0,9) \times (-0,9) = -0,729$$
е) $$(-2,4)^2 = (-2,4) \times (-2,4) = 5,76$$
ж) $$(-\frac{1}{2})^5 = -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} = -\frac{1}{32} = -0.03125$$
з) $$(-\frac{1}{2})^6 = -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} \times -\frac{1}{2} = \frac{1}{64} = 0.015625$$
и) $$-0,9^3 = -(0,9 \times 0,9 \times 0,9) = -0,729$$
к) $$-2,4^2 = -(2,4 \times 2,4) = -5,76$$