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若点p(1,1)为圆(x-3)2+y2=9的弦MN的中点,则弦MN所在直线方程为...
若点p(1,1)为圆(x-3)2+y2=9的弦MN的中点,则弦MN所在直线方程为 .
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已知向量
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=(-1,0),
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=(1,1),则与
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+4
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同向的单位向量的坐标表示为
.
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,f(-2)=-3,数列{a
n}满足a
1=-1,且S
n=2a
n+n,(其中S
n为{a
n}的前n项和).则f(a
5)+f(a
6)=( )
A.-3
B.-2
C.3
D.2
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已知平面直角坐标系xOy上的区域D由不等式组
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给定.若M(x,y)为D上的动点,点A的坐标为
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,则z=
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•
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的最大值为( )
A.3
B.4
C.3
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在△ABC中,a,b,c是∠A,∠B,∠C的对边,若
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B.钝角三角形
C.等边三角形
D.等腰直角三角形
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如果不等式f(x)=ax
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A.
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B.
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C.
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D.
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