19.设f(x)是定义在R上的奇函数,且f(x+3)•f(x)=-1,f(1)=-2,则f(2015)=( )
| A. | 0 | B. | 0.5 | C. | -2 | D. | 2 |
18.已知幂函数y=f(x)的图象经过点$(4,\frac{1}{2})$,且f(a+1)<f(10-2a),则实数a的取值范围是( )
| A. | (-1,5) | B. | (-∞,3) | C. | (3,+∞) | D. | (3,5) |
17.已知$\overrightarrow{a}$=(1,2),$\overrightarrow{b}$=(-2,0),且k$\overrightarrow{a}$+$\overrightarrow{b}$与$\overrightarrow{a}$垂直,则k=( )
| A. | -1 | B. | $\frac{5}{2}$ | C. | $\frac{2}{5}$ | D. | $-\frac{2}{5}$ |
16.设函数f(x)满足f(x+2π)=f(x),f(0)=0,则f(4π)=( )
| A. | 0 | B. | π | C. | 2π | D. | 4π |
15.已知集合A={0,1,2},集合B={0,2,4},则A∩B=( )
| A. | {0,1,2} | B. | {0,2} | C. | {0,4} | D. | {0,2,4} |
14.已知函数g(x)满足g(x)=g′(1)ex-1-g(0)x+$\frac{1}{2}{x}^{2}$,且存在实数x0使得不等式2m-1≥g(x0)成立,则m的取值范围为( )
| A. | (-∞,2] | B. | (-∞,3] | C. | [1,+∞) | D. | [0,+∞) |
13.在平面直角坐标系中,记不等式组$\left\{\begin{array}{l}{y-x≥0}\\{y-{x}^{2}≤0}\\{x≤2}\end{array}\right.$所围成的平面区域的面积为S,则S为( )
0 226707 226715 226721 226725 226731 226733 226737 226743 226745 226751 226757 226761 226763 226767 226773 226775 226781 226785 226787 226791 226793 226797 226799 226801 226802 226803 226805 226806 226807 226809 226811 226815 226817 226821 226823 226827 226833 226835 226841 226845 226847 226851 226857 226863 226865 226871 226875 226877 226883 226887 226893 226901 266669
| A. | $\frac{5}{6}$ | B. | $\frac{1}{2}$ | C. | $\frac{1}{6}$ | D. | 1 |