优优班--学霸训练营 > 知识点挑题
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            • 1.
              已知\(\triangle OAB\)中,点\(D\)在线段\(OB\)上,且\(OD=2DB\),延长\(BA\)到\(C\),使\(BA=AC.\)设\( \overrightarrow{OA}= \overrightarrow{a}, \overrightarrow{OB}= \overrightarrow{b}\).
              \((1)\)用\( \overrightarrow{a}, \overrightarrow{b}\)表示向量\( \overrightarrow{OC}, \overrightarrow{DC}\);
              \((2)\)若向量\( \overrightarrow{OC}\)与\( \overrightarrow{OA}+k \overrightarrow{DC}\)共线,求\(k\)的值.
            • 2.
              向量\( \overrightarrow{a}=(3,2)\),\( \overrightarrow{b}=(-1,2)\),\( \overrightarrow{c}=(4,1)\):
              \((1)\)求满足\( \overrightarrow{a}=m \overrightarrow{b}+n \overrightarrow{c}\)的实数\(m\),\(n\);
              \((2)\)若\(( \overrightarrow{a}+k \overrightarrow{c})/\!/(2 \overrightarrow{b}- \overrightarrow{a})\),求实数\(k\).
            • 3.
              如图,在\(\triangle ABC\)中,\( \overrightarrow{AN}= \dfrac {1}{3} \overrightarrow{NC}\),\(P\)是\(BN\)上的一点,若\( \overrightarrow{AP}=m \overrightarrow{AB}+ \dfrac {2}{11} \overrightarrow{AC}\),则实数\(m\)的值为 ______ .
            • 4.
              如图,在\(\triangle ABC\)中,\( \overrightarrow{AN}= \dfrac {1}{2} \overrightarrow{NC}\),\(P\)是\(BN\)上的一点,若\( \overrightarrow{AP}=m \overrightarrow{AB}+ \dfrac {2}{9} \overrightarrow{AC}\),则实数\(m\)的值为\((\)  \()\)
              A.\(3\)
              B.\(1\)
              C.\( \dfrac {1}{3}\)
              D.\( \dfrac {1}{9}\)
            • 5.
              已知非零向量\( \overrightarrow{OA}, \overrightarrow{OB}\)不共线,且\(2 \overrightarrow{OP}=x \overrightarrow{OA}+y \overrightarrow{OB}\),若\( \overrightarrow{PA}=λ \overrightarrow{AB}(λ∈R)\),则\(x\),\(y\)满足的关系是\((\)  \()\)
              A.\(x+y-2=0\)
              B.\(2x+y-1=0\)
              C.\(x+2y-2=0\)
              D.\(2x+y-2=0\)
            • 6.
              如图,已知\( \overrightarrow{AB}= \overrightarrow{a}\),\( \overrightarrow{AC}= \overrightarrow{b}\),\( \overrightarrow{BC}=4 \overrightarrow{BD}\),\( \overrightarrow{CA}=3 \overrightarrow{CE}\),则\( \overrightarrow{DE}=(\)  \()\)
              A.\( \dfrac {3}{4} \overrightarrow{b}- \dfrac {1}{3} \overrightarrow{a}\)
              B.\( \dfrac {5}{12} \overrightarrow{b}- \dfrac {3}{4} \overrightarrow{a}\)
              C.\( \dfrac {3}{4} \overrightarrow{a}- \dfrac {1}{3} \overrightarrow{b}\)
              D.\( \dfrac {5}{12} \overrightarrow{a}- \dfrac {3}{4} \overrightarrow{b}\)
            • 7.
              如图所示,在\(\triangle ABC\)中,点\(O\)是\(BC\)的中点,过点\(O\)的直线分别交直线\(AB\),\(AC\)于不同的两点\(M\),\(N\),若\( \overrightarrow{AB}= \dfrac {3}{5} \overrightarrow{AM}\),\( \overrightarrow{AC}=m \overrightarrow{AN}\),则\(m\)的值为 ______ .
            • 8.
              在\(\triangle ABC\)中,\(E\)为\(AC\)中点,\(D\)为\(BC\)靠近\(C\)的三等分点,记\( \overrightarrow{AB}= \overrightarrow{a}, \overrightarrow{AC}= \overrightarrow{b}\).
              \((1)\)用\( \overrightarrow{a}, \overrightarrow{b}\)表示\( \overrightarrow{AD}, \overrightarrow{BE}\);
              \((2)\)求\(BP\):\(PE\),并用\( \overrightarrow{a}, \overrightarrow{b}\)表示\( \overrightarrow{CP}\).
            • 9.
              已知\(\triangle ABC\)和平面上一点\(O\)满足\( \overrightarrow{OA}+ \overrightarrow{OB}+ \overrightarrow{OC}= \overrightarrow{0}\),若存在实数\(λ\)使得\( \overrightarrow{AB}=λ \overrightarrow{OA}- \overrightarrow{AC}\),则\(λ=(\)  \()\)
              A.\(-3\)
              B.\( \dfrac {3}{4}\)
              C.\(- \dfrac {3}{4}\)
              D.\(3\)
            • 10.
              如图,在矩形\(ABCD\)中,\(M\)是\(BC\)的中点,\(N\)是\(CD\)的中点,若\( \overrightarrow{AC}=λ \overrightarrow{AM}+μ \overrightarrow{BN}\),则\(λμ=\) ______ .
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