7.设f(x)=x2+11x+7.则f(x+1)=( )
A. | x2-13x+19 | B. | x2-13x+18 | C. | x2+13x+19 | D. | x2+13x+18 |
5.已知函数f(x)=x+$\frac{a}{x}$+1的值域为(-∞,-1]∪[3,+∞),则a2008=( )
A. | $\frac{1}{2}$ | B. | 1 | C. | $\frac{3}{2}$ | D. | 2 |
4.不等式log0.3(x2-3x-4)-log0.3(2x+10)>0的解集是( )
A. | (-2,-1) | B. | (4,7) | C. | (-2,-1)∪(4,7) | D. | ∅ |
20.抛物线y2=2px(p>0)的弦PQ的中点为(x0,y0)(y0≠0),则弦PQ的斜率是( )
A. | $\frac{p}{{y}_{0}}$ | B. | -$\frac{p}{{y}_{0}}$ | C. | px0 | D. | -px0 |
19.已知集合A={x|lg(x-1)<1},B={x|$\frac{x+2}{4-x}$≥0},则A∩B=( )
A. | {x|-2≤x≤4} | B. | {x|4<x<11} | C. | {x|1<x<4} | D. | {x|-2≤x<4} |
18.已知,a,b,c(a>b>c)是△ABC的角A,B,C的对边,若4sin2(B+C)-3=0,则$\frac{asin(\frac{π}{6}-C)}{b-c}$的值为( )
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A. | $\frac{1}{2}$ | B. | $\frac{\sqrt{3}}{2}$ | C. | $\frac{1}{4}$ | D. | $\frac{\sqrt{3}}{4}$ |