13.(5分)设向量 $\overrightarrow{\mathrm{a}}, \overrightarrow{\mathrm{b}}$ 不平行,向量 $\lambda \overrightarrow{\mathrm{a}}+\overrightarrow{\mathrm{b}}$ 与 $\overrightarrow{\mathrm{a}}+2 \overrightarrow{\mathrm{~b}}$ 平行,则实数 $\lambda=-\frac{1}{2}$
$\_\_\_\_$ $\frac{1}{2}$ .
平面向量的实际背景及基本概念 · 历年高考数学真题与解析
本页汇总 高考真题检索 的「平面向量的实际背景及基本概念」高考数学真题共 5 道,覆盖 2008–2015 年,最常出题型为 单选题;含完整答案与解析。
5questions
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2008–2015
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区分题为主
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5.设 $\vec{a}, \vec{b}, \vec{c}$ 是非零向量,已知命题 $\mathrm{P}:$ 若 $\vec{a} \cdot \vec{b}=0, \vec{b} \cdot \vec{c}=0$ ,则 $\vec{a} \cdot \vec{c}=0$ ;命题 $\mathrm{q}: ~$ 若 $\vec{a} / / \vec{b}, \vec{b} / / \vec{c}$ ,则 $\vec{a} / / \vec{c}$ ,则下列命题中真命题是
(3)已知点 $A(1,3), B(4,-1)$,则与向量 $\overrightarrow{A B}$ 同方向的单位向量为
8.平面向量 $\boldsymbol{a}, \boldsymbol{b}$ 共线的充要条件是
9、平面向量 $\vec{a}, \vec{b}$ 共线的充要条件是
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