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已知向量集合M={a|a=(1,2)+λ(3,4),λ∈R},N={b|b=(-...
已知向量集合M={a|a=(1,2)+λ(3,4),λ∈R},N={b|b=(-2,-2)+λ(4,5),λ∈R},则M∩N= .
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在△ABC中,已知
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已知|
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)=-36,则
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O是平面上一定点,A,B,C是平面上不共线的三个点,动点P满足
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