2.若实数k∈[-2,3],则函数f(x)=kx+1在[-1,1]上恒大于0的概率是( )
A. | $\frac{1}{5}$ | B. | $\frac{2}{5}$ | C. | $\frac{3}{5}$ | D. | $\frac{4}{5}$ |
20.已知集合M={x|-4x+4a<0}且2∉M,则实数a的取值范围是( )
A. | {x|x>1} | B. | {x|x≥1} | C. | {x|x≥2} | D. | {x|0≤x<1} |
16.已知函数f(x)=$\left\{\begin{array}{l}{2x-1,-1<x≤2}\\{{x}^{2}-2,2<x<3}\end{array}\right.$,则不等式f(x)>x的解集为( )
A. | (1,3) | B. | (-∞,1)∪(3,+∞) | C. | {2} | D. | (1,2)∪(2,3) |
15.若tan(π-θ)=-$\frac{\sqrt{3}}{2}$,则$\frac{sinθcosθ}{3co{s}^{2}θ-2si{n}^{2}θ}$=$\frac{\sqrt{3}}{3}$.
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