4.f(x)是偶函数且在[0,+∞)上是减函数,且f(log2x)>f(1),则x的取值范围是( )
A. | ($\frac{1}{2}$,1) | B. | (0,$\frac{1}{2}$)∪(1,+∞) | C. | ($\frac{1}{2}$,2) | D. | (0,1)∪(2,+∞) |
3.已知$f(x)=\left\{{\begin{array}{l}{x-5}&{(x≤6)}\\{f(x+2)}&{(x>6)}\end{array}}\right.$,则f(2011)等于( )
A. | 0 | B. | 1 | C. | 2 | D. | 3 |
2.已知sinθ=$\frac{m-3}{m+5}$,cosθ=$\frac{4-2m}{m+5}$($\frac{π}{2}$<θ<π),则tanθ=( )
A. | $-\frac{5}{12}$ | B. | $\frac{5}{12}$ | C. | $-\frac{3}{4}$ | D. | $\frac{3}{4}$ |
1.下列大小关系正确的是( )
A. | $log_4^{0.3}<{0.4^3}<{3^{0.4}}$ | B. | ${0.4^3}<log_4^{0.3}<{3^{0.4}}$ | ||
C. | $log_4^{0.3}<{3^{0.4}}<{0.4^3}$ | D. | ${0.4^3}<{3^{0.4}}<log_4^{0.3}$ |
20.已知sin(π+α)=$\frac{3}{5}$,且α是第三象限的角,则cos(2π-α)的值是( )
A. | $\frac{3}{5}$ | B. | $-\frac{3}{5}$ | C. | $±\frac{3}{5}$ | D. | $-\frac{4}{5}$ |
19.已知$\vec a$=(1,2),$\vec b$=(-4,2),则$|{\overrightarrow a+\overrightarrow b}|$等于( )
A. | 25 | B. | 5 | C. | 7 | D. | $\sqrt{7}$ |
18.已知全集U={1,2,3,4,5,6},集合A={1,2},B={1,3,4,5},则集合(∁UA)∩B=( )
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A. | {1,2,3} | B. | {3,4,5,6} | C. | {3,4,5} | D. | {2,5,6} |