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【简答题】
已知e 1 ，e 2 是两个不共线的向量， AB =e 1 +e 2 ， CB =-λe 1 -8e 2 ， CD =3e 1 -3e 2 ，若A、B、D三点在同一条直线上，求实数λ的值．
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【单选题】Everything into account, the work is getting on well. [ ]
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take
B.
taken
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taking
D.
to take