61 балл. 3 показательных уравнения.
1. [tex]3^{x+2}+3^{2x}=30[/tex]
2. [tex]2^{3x}+2^{3x-1}+2^{3x-2}+2^{3x-3}=120[/tex]
3. [tex]9^{x}-8*3^{x}-9=0[/tex]
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