12. Вычислите:
а) $$\frac{2^{11}2^{6}}{2^{14}} = \frac{2^{11+6}}{2^{14}} = \frac{2^{17}}{2^{14}} = 2^{17-14} = 2^{3} = 8$$
б) $$\frac{3^{4}3^{5}}{3^{3}3^{3}} = \frac{3^{4+5}}{3^{3+3}} = \frac{3^{9}}{3^{6}} = 3^{9-6} = 3^{3} = 27$$
в) $$\frac{5^{7}}{5^{2}5^{3}} = \frac{5^{7}}{5^{2+3}} = \frac{5^{7}}{5^{5}} = 5^{7-5} = 5^{2} = 25$$
г) $$\frac{6^{2}6^{3}6}{6^{2}6^{2}6} = \frac{6^{2+3+1}}{6^{2+2+1}} = \frac{6^{6}}{6^{5}} = 6^{6-5} = 6^{1} = 6$$
д) $$\frac{10^{12}10^{3}}{10^{2}10^{9}10} = \frac{10^{12+3}}{10^{2+9+1}} = \frac{10^{15}}{10^{12}} = 10^{15-12} = 10^{3} = 1000$$
e) $$\frac{2^{35}2^{11}2^{6}}{2^{13}2^{27}2^{10}} = \frac{2^{35+11+6}}{2^{13+27+10}} = \frac{2^{52}}{2^{50}} = 2^{52-50} = 2^{2} = 4$$
13. При каком значении x выполняется равенство:
a) $$5^{3} : 5 = 5^{x}$$
$$5^{3-1} = 5^{x}$$
$$5^{2} = 5^{x}$$
$$x = 2$$
б) $$10^{x} : 10^{2} = 10$$
$$10^{x-2} = 10^{1}$$
$$x - 2 = 1$$
$$x = 1 + 2$$
$$x = 3$$
в) $$2^{x} : 2 = 2^{5}$$
$$2^{x-1} = 2^{5}$$
$$x - 1 = 5$$
$$x = 5 + 1$$
$$x = 6$$