📚 Exam-style Practice: Paper 2 Pure Mathematics | 考试风格练习:试卷2 纯数学
This article provides a set of exam-style practice questions for Edexcel A-Level Mathematics Paper 2 (Pure Mathematics). Working through these examples will help you revise core techniques in algebra, functions, coordinate geometry, sequences, trigonometry, exponentials, calculus, vectors and proof. Each topic includes a typical question followed by a step-by-step solution.
本文提供了一套针对爱德思A-Level数学试卷2(纯数学)的考试风格练习题。通过这些例题,你可以巩固代数、函数、坐标几何、数列、三角学、指数与对数、微积分、向量和证明等核心技巧。每个主题都包含一道典型题目及其分步解答。
1. Algebraic Methods | 代数方法
Question: Show that (x-2) is a factor of f(x)=x³ – 4x² + x + 6 and hence factorise f(x) completely.
问题:证明 (x-2) 是 f(x)=x³ – 4x² + x + 6 的因式,并由此将 f(x) 完全分解因式。
To check if (x-2) is a factor, evaluate f(2): f(2) = (2)³ – 4(2)² + 2 + 6 = 8 – 16 + 2 + 6 = 0. Since f(2)=0, the Factor Theorem confirms (x-2) is a factor.
检验 (x-2) 是否为因式,计算 f(2):f(2) = 8 – 16 + 2 + 6 = 0。由因式定理,f(2)=0 说明 (x-2) 是因式。
Now divide f(x) by (x-2). Using polynomial division or comparing coefficients, we obtain the quotient x² – 2x – 3.
接下来用 f(x) 除以 (x-2)。通过多项式除法或系数比较,得到商 x² – 2x – 3。
Factorise the quadratic: x² – 2x – 3 = (x-3)(x+1).
对二次式因式分解:x² – 2x – 3 = (x-3)(x+1)。
Therefore, the complete factorisation is f(x) = (x-2)(x-3)(x+1).
因此,完全分解为 f(x) = (x-2)(x-3)(x+1)。
2. Functions and Graphs | 函数与图像
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