已知平面上三点
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在一条直线上,
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,
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,
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,且
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,求实数
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的值.
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题型:解答题
已知向量
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=(cos
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,sin
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)
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=(cos
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,sin
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),
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之间满足
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(1)用k表示
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(2)求
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(12分)
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已知非零向量
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和
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满足
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,且
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,
则△ABC为 ( )
A.等边三角形 | B.等腰非直角三角形 |
C.非等腰三角形 | D.等腰直角三角形 |
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△ABC的外接圆的圆心为
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,半径为1,
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且
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,则向量
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在
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方向上
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的投影为
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已知向量

=(1,2),
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=(x,4),且
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

,则x=" "
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