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IGCSE Mathematics Vectors: Complete Revision Guide | IGCSE 数学向量:完整复习指南

2026-08-30 05:08 · 本文部分内容由AI辅助创作

📚 IGCSE Mathematics Vectors: Complete Revision Guide | IGCSE 数学向量:完整复习指南

Vectors are one of the most versatile topics in IGCSE Mathematics. They connect geometry, algebra, and coordinate systems, and they regularly appear in both Paper 2 (short-answer) and Paper 4 (structured long-answer) questions. This guide walks you through everything you need for the Extended syllabus: vector notation, addition and subtraction, scalar multiplication, magnitude, position vectors, parallel vectors, collinearity, and the classic geometric proof problems.

向量是 IGCSE 数学中综合性最强的专题之一,它将几何、代数与坐标系紧密联系在一起,无论是 Paper 2(简答题)还是 Paper 4(结构化长答题)都会频繁考查。本指南将按照 Extended 大纲系统讲解:向量表示、加减法、数乘、模长、位置向量、平行向量、共线点,以及经典的几何证明题。


1. What Is a Vector? | 什么是向量?

In IGCSE Mathematics, quantities are divided into two types: scalars and vectors. A scalar has only a magnitude (size), such as distance, speed, mass, or temperature. A vector has both magnitude and direction, such as displacement, velocity, acceleration, or force. If you walk 5 kilometres, the "5 kilometres" is a scalar. If you walk 5 kilometres due north, that journey is a vector: it tells you both how far and in which direction.

在 IGCSE 数学中,量分为两类:标量与向量。标量只有大小(模),例如距离、速率、质量或温度。向量既有大小又有方向,例如位移、速度、加速度或力。如果你走了 5 公里,这个"5 公里"是标量;如果你向正北走了 5 公里,这段路程就是向量:它既告诉你走了多远,也告诉你朝哪个方向。

Quantity 量 Type 类型 Reason 原因
Distance 距离: 5 km Scalar 标量 Only size 只有大小
Displacement 位移: 5 km north 向正北 5 公里 Vector 向量 Size and direction 有大小和方向
Speed 速率: 10 m/s Scalar 标量 Only size 只有大小
Velocity 速度: 10 m/s east 向东西 10 m/s Vector 向量 Size and direction 有大小和方向

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2. Vector Notation | 向量的表示

single vector can also be named using a bold lower-case letter, such as a (in handwriting, you underline the letter). In coordinate form, a vector records the horizontal change (x-component) and the vertical change (y-component).

向量有多种表示方法。从点 A 指向点 B 的有向线段记作 →AB。单个向量也可以用粗体小写字母表示,例如 a(手写时通常在字母下加横线)。在坐标形式中,向量记录水平变化量(x 分量)和垂直变化量(y 分量)。

The vector that moves 2 units right and 3 units up is written as the column vector below, with the x-component on top and the y-component on the bottom.

向右移动 2 个单位、向上移动 3 个单位的向量写作下面的列向量,其中 x 分量在上,y 分量在下。

a =
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