Ответ (RU):
- a) $$7^{2} = 7 \cdot 7 = 49$$
- б) $$2^{5} - 3^{4} = 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 - 3 \cdot 3 \cdot 3 \cdot 3 = 32 - 81 = -49$$
- в) $$(\frac{5}{6})^{2} \cdot (-3)^{2} = \frac{5}{6} \cdot \frac{5}{6} \cdot (-3) \cdot (-3) = \frac{25}{36} \cdot 9 = \frac{25 \cdot 9}{36} = \frac{25 \cdot 1}{4} = \frac{25}{4} = 6\frac{1}{4} = 6.25$$
Ответ: a) 49; б) -49; в) 6.25