优优班--学霸训练营 > 知识点挑题
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            • 1.
              在长方体\(ABCD-A_{1}B_{1}C_{1}D_{1}\)中,\( \overrightarrow{BA}+ \overrightarrow{BC}+ \overrightarrow{DD_{1}}=(\)  \()\)
              A.\( \overrightarrow{D_{1}B_{1}}\)
              B.\( \overrightarrow{D_{1}B}\)
              C.\( \overrightarrow{DB_{1}}\)
              D.\( \overrightarrow{BD_{1}}\)
            • 2.
              如图:在平行六面体\(ABCD-A_{1}B_{1}C_{1}D_{1}\)中,\(M\)为\(A_{1}C_{1}\)与\(B_{1}D_{1}\)的交点\(.\)若\( \overrightarrow{AB}= \overrightarrow{a}\),\( \overrightarrow{AD}= \overrightarrow{b}\),\( \overrightarrow{AA_{1}}= \overrightarrow{c}\),则下列向量中与\( \overrightarrow{BM}\)相等的向量是\((\)  \()\)
              A.\(- \dfrac {1}{2} \overrightarrow{a}+ \dfrac {1}{2} \overrightarrow{b}+ \overrightarrow{c}\)
              B.\( \dfrac {1}{2} \overrightarrow{a}+ \dfrac {1}{2} \overrightarrow{b}+ \overrightarrow{c}\)
              C.\(- \dfrac {1}{2} \overrightarrow{a}- \dfrac {1}{2} \overrightarrow{b}+ \overrightarrow{c}\)
              D.\( \dfrac {1}{2} \overrightarrow{a}- \dfrac {1}{2} \overrightarrow{b}+ \overrightarrow{c}\)
            • 3.
              直三棱柱\(ABC-A_{1}B_{1}C_{1}\)中,若\( \overrightarrow{CA}= \overrightarrow{a}\),\( \overrightarrow{CB}= \overrightarrow{b}\),\( \overrightarrow{CC_{1}}= \overrightarrow{c}\),则\( \overrightarrow{A_{1}B}=(\)  \()\)
              A.\( \overrightarrow{a}+ \overrightarrow{b}- \overrightarrow{c}\)
              B.\( \overrightarrow{a}- \overrightarrow{b}+ \overrightarrow{c}\)
              C.\(- \overrightarrow{a}+ \overrightarrow{b}+ \overrightarrow{c}\)
              D.\(- \overrightarrow{a}+ \overrightarrow{b}- \overrightarrow{c}\)
            • 4.

              若\(\overrightarrow{a}=(1,1,1)\),\(\overrightarrow{{b}}=(1,2,3)\)且\((k\overrightarrow{a}+\overrightarrow{b})⊥\overrightarrow{a}\),则\(k=\)(    )

              A.\({3}\)
              B.\(-3\)
              C.\(-2\)
              D.\(-1\)
            • 5.

              三棱柱\(ABC-{{A}_{1}}{{B}_{1}}{{C}_{1}}\)中,若\(\overrightarrow{CA}=\overrightarrow{a},\overrightarrow{CB}=\overrightarrow{b},\overrightarrow{C{{C}_{1}}}=\overrightarrow{c}\),则\(\overrightarrow{{{A}_{1}}B}=\)

              A.\(\overrightarrow{a}+\overrightarrow{b}-\overrightarrow{c}\)
              B.\(\overrightarrow{a}-\overrightarrow{b}+\overrightarrow{c}\)        

              C.\(-\overrightarrow{a}+\overrightarrow{b}-\overrightarrow{c}\)
              D.\(-\overrightarrow{a}+\overrightarrow{b}+\overrightarrow{c}\)
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