3.已知点A(a,b)在y=-x2+3lnx的图象上,点B(m,n)在y=x+2的图象上,则(a-m)2+(b-n)2的最小值为( )
A. | $\sqrt{2}$ | B. | 2 | C. | $2\sqrt{2}$ | D. | 8 |
2.已知函数f(x)=loga(x+1)(a>0,a≠1)在[0,1]上的值域是[0,1],若函数g(x)=ax-m-4的图象不过第二象限,则m的取值范围是( )
A. | [-2,+∞) | B. | [-$\frac{1}{2}$,+∞) | C. | [-1,+∞) | D. | (-∞,2] |
1.已知椭圆E:$\frac{{x}^{2}}{{a}^{2}}$+$\frac{{y}^{2}}{{b}^{2}}$=1(a>b>0)过点P(3,1),其左、右焦点分别为F1、F2,且$\overrightarrow{{F}_{1}P}$•$\overrightarrow{{F}_{2}P}$=-6,则椭圆E的离心率是( )
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A. | $\frac{\sqrt{2}}{3}$ | B. | $\frac{1}{2}$ | C. | $\frac{\sqrt{2}}{2}$ | D. | $\frac{2\sqrt{2}}{3}$ |