12.若角α的终边过点(-1,2),则cos(π-2α)的值为( )
A. | $\frac{3}{5}$ | B. | -$\frac{3}{5}$ | C. | $\frac{\sqrt{5}}{5}$ | D. | -$\frac{\sqrt{5}}{5}$ |
11.设函数f(x)=$\left\{\begin{array}{l}{1-{x}^{2},x≤1}\\{{x}^{2}+x-2,x>1}\end{array}\right.$则f($\frac{1}{f(2)}$)的值为( )
A. | 18 | B. | -$\frac{27}{16}$ | C. | $\frac{8}{9}$ | D. | $\frac{15}{16}$ |
10.已知点M(3,-2),N(-5,-1),且$\overrightarrow{MP}=\frac{1}{2}\overrightarrow{MN}$,则点P是( )
A. | (-8,1) | B. | (-1,-$\frac{3}{2}$) | C. | (1,$\frac{3}{2}$) | D. | (8,1) |
9.已知全集U=R,A={y|y=2x+1},B={x|lnx<0},则A∩B=( )
A. | {x|0<x<1} | B. | {x|$\frac{1}{2}$<x≤1} | C. | {x|x<1} | D. | ∅ |
8.椭圆$\frac{4}{25}{x^2}+\frac{y^2}{5}$=1过右焦点有n条弦的长度成等差数列,最小弦长为数列的首项a1,最大弦长为an,若公差为d$∈[\frac{1}{6},\frac{1}{3}],那么n$的取值集合为( )
A. | {4,5,6,7} | B. | {4,5,6} | C. | {3,4,5,6} | D. | {3,4,5,6,7} |
6.阅读如图所示的程序框图,运行相应的程序,若输出的结果s=16,则图中菱形内应该填写的内容是( )
A. | n<2? | B. | n<3? | C. | n<4? | D. | n<5? |
5.已知定义域为R的偶函数f(x)在(0,+∞)上为增函数,则( )
A. | f(4)>f(3) | B. | f(-5)>f(5) | C. | f(-3)>f(-5) | D. | f(3)>f(-6) |
4.“a≥-3”是“f(x)=-|x+a|在[3,+∞)上为减函数”的什么条件( )
0 252386 252394 252400 252404 252410 252412 252416 252422 252424 252430 252436 252440 252442 252446 252452 252454 252460 252464 252466 252470 252472 252476 252478 252480 252481 252482 252484 252485 252486 252488 252490 252494 252496 252500 252502 252506 252512 252514 252520 252524 252526 252530 252536 252542 252544 252550 252554 252556 252562 252566 252572 252580 266669
A. | 充分不必要 | B. | 必要不充分 | C. | 充要 | D. | 不充分不必要 |