优优班--学霸训练营 > 知识点挑题
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            • 1.
              在\(\triangle OAB\)中,\(P\)为\(AB\)边上一点,且\( \overrightarrow{BP}=3 \overrightarrow{PA}\),若\( \overrightarrow{OP}=x \overrightarrow{OA}+y \overrightarrow{OB}\),则\((\)  \()\)
              A.\(x= \dfrac {2}{3}\),\(y= \dfrac {1}{3}\)
              B.\(x= \dfrac {2}{3}\),\(y= \dfrac {2}{3}\)
              C.\(x= \dfrac {1}{4}\),\(y= \dfrac {3}{4}\)
              D.\(x= \dfrac {3}{4}\),\(y= \dfrac {1}{4}\)
            • 2.
              已知平面直角坐标系内的两个向量\( \overrightarrow{a}=(3,-2m)\),\( \overrightarrow{b}=(1,m-2)\),且平面内的任一向量\( \overrightarrow{c}\)都可以唯一地表示成\( \overrightarrow{c}=λ \overrightarrow{a}+μ \overrightarrow{b}(λ,μ\)为实数\()\),则实数\(m\)的取值范围是\((\)  \()\)
              A.\((-∞,2)\)
              B.\(( \dfrac {6}{5},+∞)\)
              C.\((-∞,-2)∪(-2,+∞)\)
              D.\((-∞, \dfrac {6}{5})∪( \dfrac {6}{5},+∞)\)
            • 3.
              如图,有\(5\)个全等的小正方形,\( \overrightarrow{BD}=x \overrightarrow{AE}+y \overrightarrow{AF}\),则\(x+y\)的值是 ______ .
            • 4.
              在\(\triangle ABC\)中,\(AD\)为\(BC\)边上的中线,\(E\)为\(AD\)的中点,则\( \overrightarrow{EB}=(\)  \()\)
              A.\( \dfrac {3}{4} \overrightarrow{AB}- \dfrac {1}{4} \overrightarrow{AC}\)
              B.\( \dfrac {1}{4} \overrightarrow{AB}- \dfrac {3}{4} \overrightarrow{AC}\)
              C.\( \dfrac {3}{4} \overrightarrow{AB}+ \dfrac {1}{4} \overrightarrow{AC}\)
              D.\( \dfrac {1}{4} \overrightarrow{AB}+ \dfrac {3}{4} \overline {AC}\)
            • 5.
              如图,在三角形\(OPQ\)中,\(M\)、\(N\)分别是边\(OP\)、\(OQ\)的中点,点\(R\)在直线\(MN\)上,且\( \overrightarrow{OR}=x \overrightarrow{OP}+y \overrightarrow{OQ}(x,y∈R)\),则代数式\( \sqrt {x^{2}+y^{2}-x-y+ \dfrac {1}{2}}\)的最小值为 ______ .
            • 6.
              如图所示,向量\( \overrightarrow{OA}= \overrightarrow{a}, \overrightarrow{OB}= \overrightarrow{b}, \overrightarrow{OC}= \overrightarrow{c,}A,B,C\)在一条直线上,且\( \overrightarrow{AC}=-4 \overrightarrow{CB}\)则\((\)  \()\)
              A.\( \overrightarrow{c}= \dfrac {1}{2} \overrightarrow{a}+ \dfrac {3}{2} \overrightarrow{b}\)
              B.\( \overrightarrow{c}= \dfrac {3}{2} \overrightarrow{a}- \dfrac {1}{2} \overrightarrow{b}\)
              C.\( \overrightarrow{c}=- \overrightarrow{a}+2 \overrightarrow{b}\)
              D.\( \overrightarrow{c}=- \dfrac {1}{3} \overrightarrow{a}+ \dfrac {4}{3} \overrightarrow{b}\)
            • 7.
              如图所示,已知点\(G\)是\(\triangle ABC\)的重心,过点\(G\)作直线与\(AC\)两边分别交于\(M\),\(N\)两点,且\( \overrightarrow{AM}=x \overrightarrow{AB}\),\( \overrightarrow{AN}=y \overrightarrow{AC}\),则\(x+2y\)的最小值为 ______ .
            • 8.
              已知\(A\)、\(B\)、\(C\)三点不共线,且点\(O\)满足\( \overrightarrow{OA}+ \overrightarrow{OB}+ \overrightarrow{OC}= \overrightarrow{0}\),则下列结论正确的是\((\)  \()\)
              A.\( \overrightarrow{OA}= \dfrac {1}{3} \overrightarrow{AB}+ \dfrac {2}{3} \overrightarrow{BC}\)
              B.\( \overrightarrow{OA}=- \dfrac {2}{3} \overrightarrow{AB}- \dfrac {1}{3} \overrightarrow{BC}\)
              C.\( \overrightarrow{OA}=- \dfrac {1}{3} \overrightarrow{AB}- \dfrac {2}{3} \overrightarrow{BC}\)
              D.\( \overrightarrow{OA}= \dfrac {2}{3} \overrightarrow{AB}+ \dfrac {1}{3} \overrightarrow{BC}\)
            • 9.
              如图所示,在正方形\(ABCD\)中,点\(E\)为边\(BC\)的中点,点\(F\)为边\(CD\)上的靠近点\(C\)的四等分点,点\(G\)为边\(AE\)上的靠近点\(A\)的三等分点,则向量\( \overrightarrow{FG}\)用\( \overrightarrow{AB}\)与\( \overrightarrow{AD}\)表示为 ______ .
            • 10.
              在平行四边形\(ABCD\)中,若\( \overrightarrow{AD}=λ \overrightarrow{AC}+μ \overrightarrow{BA}\),则\(λ+μ=\) ______ .
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