1.
0, \\
2a^2-17a+8=0, \\
D=225, \\
a_1= \frac{1}{2} , a_2=8, \\
2^{x}=\frac{1}{2}, \\
2^{x}=2^{-1}, \\
x=-1, \\ 2^{x}=8, \\
2^{x}=2^{3}, \\
x=3." alt="2\cdot2^{2x}-17\cdot2^{x}+8=0, \\
2\cdot(2^{x})^2-17\cdot2^{x}+8=0, \\
2^{x}=a, a>0, \\
2a^2-17a+8=0, \\
D=225, \\
a_1= \frac{1}{2} , a_2=8, \\
2^{x}=\frac{1}{2}, \\
2^{x}=2^{-1}, \\
x=-1, \\ 2^{x}=8, \\
2^{x}=2^{3}, \\
x=3." align="absmiddle" class="latex-formula">
2.
0, \\
5a^2-7a+2=0, \\
D=9, \\
a_1= \frac{2}{5} <0, a_2=1, \\
(\frac{2}{5})^{x}=\frac{2}{5}, \\
x_1=1, \\
(\frac{2}{5})^{x}=1, \\
(\frac{2}{5})^{x}=(\frac{2}{5})^0, \\
x_2=0." alt="5\cdot 2^{2x}-7\cdot 10^{x}+2\cdot 5^{2x}=0, \\
5\cdot (2^{x})^2-7\cdot (2\cdot5)^{x}+2\cdot (5^{x})^2=0, \\
5\cdot ((\frac{2}{5})^{x})^2-7\cdot(\frac{2}{5})^{x}+2=0, \\
(\frac{2}{5})^{x}=a, a>0, \\
5a^2-7a+2=0, \\
D=9, \\
a_1= \frac{2}{5} <0, a_2=1, \\
(\frac{2}{5})^{x}=\frac{2}{5}, \\
x_1=1, \\
(\frac{2}{5})^{x}=1, \\
(\frac{2}{5})^{x}=(\frac{2}{5})^0, \\
x_2=0." align="absmiddle" class="latex-formula">
3.