решите уравнения и неравенство, пожалуйста
1) 100^{x} - 70 * 10^{x-1}- 30=0 [/tex]
2)[tex]( \frac{1}{2} ) ^{2x-1} - 5^{1-2x} = 0[/tex]
3)[tex] 0,2^{ \frac{3x-y}{x-2} } \ \textgreater \ \frac{1}{5} [/tex]
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