Помогите с примерами

3. a) $2^{x} - 2^{x-3}=7 2^{x}- \frac{ 2^{x} }{8} =7 8* 2^{x} - 2^{x} =56 2^{x} 7=56 2^{x} =8 x=3$

б) 3* $25^{х} -14* 5^{х} -5=0 3* 5^{2x} -14* 5^{x} -5=0 3 y^{2} -14y-5=0 d=196+60=256 \sqrt{d} =16 y1=5 y2=-1/3 5^{x} =5 x=1$

1. C D

4/ a) $0.6^{x-3} \geq \frac{125}{27} 0.6^{x} \geq \frac{125}{27} 0.216 0.6^{x} \geq 1 x \geq 0$

,) $3^{2x} -3* 3^{x} \ \textless \ 0 y^{2} -3y\ \textless \ 0 y(y-3)\ \textless \ 0 \left \{ {{ 3^{x}\ \textgreater \ 0 } \atop { 3^{x}\ \textless \ 3 }} \right. x e R x\ \textless \ 1 Ответ x\ \textless \ 1$