8.已知a1,a2为雅着次往慨方程似 overline (x)=overline (b) 的两个解,-|||-又 _(1)overline ({a)_(1)}+(k)_(2)overline ({a)_(2)}((k)_(1):k 为家数)也为 overline (x)=overline (b) 的解,则() ()-|||-A _(1)+(k)_(2)=1-|||-B _(1)+(k)_(2)neq 1-|||-C _(1)+(k)_(2)=0-|||-D _(1)+(k)_(2)neq 0