已知点A(-1,0),点B (1,0),点P(x+1,y)在x轴的下方,设a=
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,b=
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,c=
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,d=|
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|,且
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=0.
(1)求a、b、c关于x、y的表达式;
(2)求y关于x的函数关系式y=f(x),并求当y取得最小值时P点的坐标.
考点分析:
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A.存在x
∈R,使得f(x
)<g(x
)
B.有无数多个实数x,使得f(x)<g(x)
C.对任意x∈R,都有f(x)+
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<g(x)
D.不存在实数x,使得f(x)≥g(x)
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下列说法错误的是( )
A.若z∈C,则|z|=1的充要条件是
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B.若z=sinθ+icosθ(其中0<θ<
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),则(
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2<0
C.若方程x
2+bx+c=0的系数不都是实数,则此方程必有虚数根
D.复数(a-b)+(a+b)i为纯虚数的充要条件是a、b∈R,且a=b
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183030343189047/SYS201310241830303431890015_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183030343189047/SYS201310241830303431890015_ST/1.png)
是不平行于x轴的单位向量,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183030343189047/SYS201310241830303431890015_ST/2.png)
,则
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=( )
A.(
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)
B.(
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)
C.(
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)
D.(1,0)
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已知函数y=2sin(ωx+φ)(ω>0))在区间[0,2π]的图象如下:那么ω=( )
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A.1
B.2
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183030343189047/SYS201310241830303431890014_ST/0.png)
D.
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若f(n)为n
2+1的各位数字之和(n∈N
*).如:因为14
2+1=197,1+9+7=17,所以f(14)=17.记f
1(n)=f(n),f
2(n)=f(f
1(n)),…,f
k+1(n)=f(f
k(n)),k∈N
*,则f
2005(8)=
.
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