A
[tex] \\ (0.8) {}^{4} \div (2 \frac{2}{3} ) {}^{4 } = (0.8 \div 2\frac{2}{3} ) {}^{4} = ( \frac{4}{5} \div \frac{8}{3} ) {}^{4} \\ \\ = ( \frac{4}{5} \times \frac{3}{8} ) {}^{4} = ( \frac{3}{10} ) {}^{4} = \frac{81}{10000} [/tex]
81
_____ = 0,0081
10000
B
[tex](4 \frac{1}{2} ) {}^{3} \times ( - \frac{2}{3} ) {}^{3} \times ( - 2) {}^{3} = \\ \\ = ( \frac{9}{2} \times \frac{2}{3} \times 2 ) {}^{3} = \\ \\ = (3 \times 2) {}^{3} = {6}^{3} [/tex]
6^3 = 216
