(a) \({\displaystyle\frac{2^{3x+1}+2^{3x-1}-5\cdot2^{3x-3}}{4^{x+1}-4^{x-1}}}\)
(b) \({\displaystyle\frac{a^{x+2}-a^{x+1}-2a^x}{a^{x+2}-2a^{x+1}}}\)
Domov