2) a) \(\left\)\(4\cdot\frac{3}{8}\right\)^2; 6) \(\left\)\(6:\frac{2}{3}\right\)^3; B) 7+7^2; r) (4,9-5,1)^2;

Решение:

1. a) \( \left(4\cdot\frac{3}{8}\right)^2 = \left(\frac{12}{8}\right)^2 = \left(\frac{3}{2}\right)^2 = \frac{9}{4} = 2.25 \)
2. 6) \( \left(6:\frac{2}{3}\right)^3 = \left(6\cdot\frac{3}{2}\right)^3 = \left(\frac{18}{2}\right)^3 = 9^3 = 729 \)
3. B) \( 7+7^2 = 7+49 = 56 \)
4. r) \( (4.9-5.1)^2 = (-0.2)^2 = 0.04 \)

Ответ: a) 2.25; 6) 729; B) 56; r) 0.04.