e8−e3e^{8}-e^{3}e8−e3
(e3−e8)\left(e^{3}-e^{8}\right)(e3−e8)
15(e8−e3)\frac{1}{5}\left(e^{8}-e^{3}\right)51(e8−e3)
5(e8−e3)5\left(e^{8}-e^{3}\right)5(e8−e3)