8.函数f(x)=e-x+a,g(x)=|lnx|,若x1,x2都满足f(x)=g(x),则( )
A. | x1•x2>e | B. | 1<x1•x2<e | C. | 0<x1•x2<e-1 | D. | e-1<x1•x2<1 |
6.已知点P(x,y)的坐标满足条件$\left\{\begin{array}{l}{x-2y≤1}\\{x+4y≤4}\\{x+y≥a}\end{array}\right.$,当z=-2x+y取得最大值为1时,那么x2+y2的最小值为( )
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A. | $\frac{\sqrt{2}}{2}$ | B. | $\frac{1}{2}$ | C. | 1 | D. | 2 |