优优班--学霸训练营 > 知识点挑题
全部资源
          排序:
          最新 浏览

          50条信息

            • 1.
              已知点\(A(1,1)\),\(B(4,2)\)和向量\( \overrightarrow{a}=(2,λ)\),若\( \overrightarrow{a}/\!/ \overrightarrow{AB}\),则实数\(λ\)的值为\((\)  \()\)
              A.\(- \dfrac {2}{3}\)
              B.\( \dfrac {2}{3}\)
              C.\( \dfrac {3}{2}\)
              D.\(- \dfrac {3}{2}\)
            • 2.
              已知向量\( \overrightarrow{AB}=(2-k,-1)\),\( \overrightarrow{AC}=(1,k)\).
              \((1)\)若\(A\),\(B\),\(C\)三点共线,求\(k\)的值;
              \((2)\)若\(\triangle ABC\)为直角三角形,求\(k\)的值.
            • 3.
              已知\( \overrightarrow{a}=(2,3), \overrightarrow{b}=(x,-6)\),若\(2 \overrightarrow{a}/\!/ \overrightarrow{b}\),则\(x\)的值为\((\)  \()\)
              A.\(9\)
              B.\(-9\)
              C.\(4\)
              D.\(-4\)
            • 4.
              已知向量\( \overrightarrow{a}=(3,4)\),\( \overrightarrow{b}=(\sin α,\cos α)\),且\( \overrightarrow{a}/\!/ \overrightarrow{b}\),则\(\tan α=(\)  \()\)
              A.\( \dfrac {3}{4}\)
              B.\(- \dfrac {3}{4}\)
              C.\( \dfrac {4}{3}\)
              D.\(- \dfrac {4}{3}\)
            • 5.
              已知\(α\)是锐角,\( \overrightarrow{a}=( \dfrac {3}{4},\sin α)\),\( \overrightarrow{b}=(\cos α, \dfrac {1}{3})\),且\( \overrightarrow{a}/\!/ \overrightarrow{b}\),则\(α\)为\((\)  \()\)
              A.\(15^{\circ}\)
              B.\(45^{\circ}\)
              C.\(75^{\circ}\)
              D.\(15^{\circ}\)或\(75^{\circ}\)
            • 6.
              已知向量\( \overrightarrow{a}=(\sin \) \(x\),\(\cos \) \(x)\),\( \overrightarrow{b}=( \sqrt {3}\cos \) \(x\),\(\cos \) \(x)\),且\( \overrightarrow{b}\neq 0\),定义函数\(f(x)=2 \overrightarrow{a}\cdot \overrightarrow{b}-1\).
              \((1)\)求函数\(f(x)\)的单调增区间;
              \((2)\)若\( \overrightarrow{a}/\!/ \overrightarrow{b}\),求\(\tan \) \(x\)的值;
              \((3)\)若\( \overrightarrow{a}⊥ \overrightarrow{b}\),求\(x\)的最小正值.
            • 7.
              已知\(\triangle ABC\),角\(A\),\(B\),\(C\)的对边分别是\(a\),\(b\),\(c\),向量\( \overrightarrow{m}=(a,-2b-c)\),\( \overrightarrow{n}=(\cos A,\cos C)\),且\( \overrightarrow{m}/\!/ \overrightarrow{n}\).
              \((I)\)求角\(A\)的大小;
              \((II)\)求\(2 \sqrt {3}\cos ^{2} \dfrac {C}{2}-\sin (B- \dfrac {π}{3})\)的最大值,并求取得最大值时角\(B\),\(C\)的大小.
            • 8.
              已知向量\( \overrightarrow{a}=(1,2)\),\( \overrightarrow{b}=(1,0)\),\( \overrightarrow{c}=(3,4).\)若\(λ\)为实数,\(( \overrightarrow{a}+λ \overrightarrow{b})/\!/ \overrightarrow{c}\),则\(λ=\) ______ .
            • 9.
              已知向量\( \overrightarrow{a}=(1,2)\),\( \overrightarrow{b}=(-2,t)\),若\( \overrightarrow{a}/\!/ \overrightarrow{b}\),则实数\(t\)的值是 ______ .
            • 10.
              平面内给定三个向量\( \overrightarrow{a}=(3,2)\),\( \overrightarrow{b}=(-1,2)\),\( \overrightarrow{c}=(4,1)\),若\(( \overrightarrow{a}+k \overrightarrow{c})/\!/(2 \overrightarrow{b}- \overrightarrow{a})\)则实数\(k\)的值为\((\)  \()\)
              A.\( \dfrac {16}{13}\)
              B.\( \dfrac {3}{4}\)
              C.\(- \dfrac {16}{13}\)
              D.\(- \dfrac {4}{3}\)
            0/40

            进入组卷