9.如图,在矩形 OABC中,$\overrightarrow{{A}{B}}=3\overrightarrow{{A}{E}}$,$\overrightarrow{{B}C}=3\overrightarrow{FC}$,若$\overrightarrow{{O}{B}}=λ\overrightarrow{{O}{E}}+μ\overrightarrow{{O}F}$(λ,μ∈R),则λμ等于( )
A. | $\frac{9}{4}$ | B. | $\frac{9}{16}$ | C. | $\frac{4}{9}$ | D. | $\frac{16}{9}$ |
8.在△ABC中,角A、B、C所对边分别为a、b、c,若asinB=2bsinAcosC,则角C的大小为( )
A. | $\frac{π}{6}$ | B. | $\frac{π}{4}$ | C. | $\frac{π}{3}$ | D. | $\frac{π}{2}$ |
7.曲线f(x)=x3+$\sqrt{x}$在点(1,2)处的切线方程为( )
A. | 4x-y-2=0 | B. | 7x-2y-3=0 | C. | 3x-y-1=0 | D. | 5x-y-3=0 |
6.若集合 M={1,2,4},N={1,4,6},则M∩N等于( )
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A. | {1,4} | B. | {1,4,6} | C. | {2,4,6} | D. | {1,2,4,6} |