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劍橋 A-Level 數學 9709 Paper 1 純數模擬卷(10 題・75 分・1 小時 50 分鐘)

劍橋 A-Level 數學 9709 Paper 1 純數模擬卷(10 題・75 分・1 小時 50 分鐘)

  • 2026-10-29

劍橋 A-Level 數學 9709 Paper 1 純數模擬卷(10 題・75 分・1 小時 50 分鐘)

TUTORZONE 原創模擬卷 · 劍橋 A-Level 數學 9709 Paper 1(純數 1)

本卷照劍橋 A-Level 數學 9709 Paper 1(純數 1)的卷制編寫:全卷 10 題,合共 75 分,時限 1 小時 50 分鐘,佔整個 A-Level 30%。

卷制速覽

項目 內容
試卷 Paper 1 Pure Mathematics 1
題數 10 題(25 部分)
分數 75 分
時限 1 小時 50 分鐘
佔比 A-Level 總分 30%
計算機 不准使用計算機

題目

全卷 10 題、25 部分,答案須寫出步驟;除特別指明外,非準確值取 3 位有效數字。

1. (6 分)二次方程與配方法

(a) Solve the equation 2x² − 7x + 3 = 0. (3 分)

(b) Express 2x² − 12x + 7 in the form a(x + b)² + c, and state the minimum value of 2x² − 12x + 7. (3 分)

2. (7 分)二項式定理

(a) Find the first three terms, in ascending powers of x, of the expansion of (1 + 2x)⁸. (3 分)

(b) Find the coefficient of x³ in the expansion. (2 分)

(c) Hence estimate the value of (1.02)⁸, giving your answer to 4 decimal places. (2 分)

3. (7 分)微分與駐點

(a) A curve has equation y = x³ − 6x² + 9x + 2. Find dy/dx. (2 分)

(b) Find the coordinates of the stationary points of the curve. (3 分)

(c) Determine the nature of each stationary point. (2 分)

4. (8 分)圓的方程

(a) The circle with equation x² + y² − 6x + 10y + 18 = 0 has centre C and radius r. Find the coordinates of C and the value of r. (4 分)

(b) The point P has coordinates (10, −5). Find the shortest distance from P to the circle. (4 分)

5. (8 分)三角方程

(a) Show that the equation 3sin²θ − 2cosθ − 2 = 0 may be written as 3cos²θ + 2cosθ − 1 = 0. (3 分)

(b) Hence solve 3cos²θ + 2cosθ − 1 = 0 for cosθ. (2 分)

(c) Hence solve 3sin²θ − 2cosθ − 2 = 0 for 0° ≤ θ ≤ 360°. (3 分)

6. (8 分)定積分與面積

(a) The curve y = x² + 2 crosses the lines x = 1 and x = 3. Find the area of the region bounded by the curve, the x-axis and these two lines. (4 分)

(b) Find the area of the region enclosed between y = x² + 2 and y = 3x + 2 for 0 ≤ x ≤ 3. (4 分)

7. (8 分)等比數列

(a) A geometric progression has first term 3 and common ratio 2/3. Find the sum to infinity. (3 分)

(b) Find the sum of the first 5 terms, giving your answer as an exact fraction. (3 分)

(c) Find the smallest value of n for which the sum of the first n terms exceeds 8.9. (2 分)

8. (8 分)餘式定理與因式定理

(a) The polynomial f(x) = 2x³ + ax² + bx − 6 has factors (x − 1) and (x + 2). Find the values of a and b. (5 分)

(b) Hence factorise f(x) completely. (3 分)

9. (8 分)鏈式法則與相關變化率

(a) Given that y = (3x − 1)⁶, find dy/dx and hence the value of dy/dx at x = 1. (4 分)

(b) The radius of a circle increases at 0.5 cm per second. Find the rate of increase of the area when the radius is 6 cm, giving your answer in exact form. (4 分)

10. (7 分)向量

(a) The points A and B have coordinates (2, −1) and (5, 3). Find the vector AB and its magnitude. (3 分)

(b) Find a unit vector in the direction of AB. (2 分)

(c) The vector (k, 8) is parallel to AB. Find k. (2 分)

答案與評分要點

以下為每部分參考答案與評分要點,M 為方法分、A 為答案分、B 為獨立分。

第 1 題 · 6 分

(a) x = 1/2 or x = 3

M1 factorises correctly as (2x − 1)(x − 3), or uses the formula with a = 2, b = −7, c = 3; A1 both roots correct.

(b) 2(x − 3)² − 11; minimum value −11 (at x = 3)

M1 takes out the factor 2 and completes the square; A1 a = 2, b = −3, c = −11; A1 minimum value −11 stated (allow “minimum at x = 3”).

第 2 題 · 7 分

(a) 1 + 16x + 112x²

M1 uses the binomial coefficients ⁱC₁ and ⁱC₂; A1 16x; A1 +112x².

(b) 448

M1 ⁱC₃ × 2³ = 56 × 8; A1 448.

(c) 1.1712 (true value 1.1717)

M1 substitutes x = 0.01 in the three terms; A1 1.1712.

第 3 題 · 7 分

(a) 3x² − 12x + 9

M1 differentiates term by term; A1 3x² − 12x + 9.

(b) (1, 6) and (3, 2)

M1 sets dy/dx = 0 and factorises 3(x − 1)(x − 3); A1 x = 1, 3; A1 both y-values correct.

(c) (1, 6) is a maximum; (3, 2) is a minimum

M1 finds d²y/dx² = 6x − 12; A1 correct classification of both points.

第 4 題 · 8 分

(a) C(3, −5), r = 4

M1 completes the square in x and in y; A1 centre (3, −5); M1 r² = 9 + 25 − 18; A1 r = 4.

(b) 3 units

M1 distance CP = 7; M1 subtracts the radius; A1 3.

第 5 題 · 8 分

(a) 3(1 − cos²θ) − 2cosθ − 2 = 0, then collect terms

M1 uses sin²θ = 1 − cos²θ; A1 expands; A1 reaches the printed form with all signs correct.

(b) cosθ = 1/3 or cosθ = −1

M1 factorises (3cosθ − 1)(cosθ + 1); A1 both values.

(c) θ = 70.5°, 180°, 289.5°

B1 θ = 180°; M1 θ = 70.5°; A1 289.5° (all to 1 d.p., no extras in range).

第 6 題 · 8 分

(a) 38/3 ≈ 12.67 square units

M1 integrates to x³/3 + 2x; M1 substitutes 3 and 1; A1 15 − 7/3; A1 38/3.

(b) 9/2 = 4.5 square units

M1 forms the difference 3x − x²; M1 integrates; A1 27/2 − 9; A1 9/2.

第 7 題 · 8 分

(a) S∞ = 9

M1 uses a/(1 − r) with r = 2/3; A1 3 ÷ (1/3) = 9; A1 states the condition that r is between −1 and 1.

(b) 211/27 ≈ 7.815

M1 uses Sₙ = a(1 − rⁿ)/(1 − r); M1 substitutes n = 5 and r = 2/3; A1 211/27.

(c) n = 12 (S₁₁ ≈ 8.896, S₁₂ ≈ 8.931)

M1 solves or tests the inequality; A1 n = 12.

第 8 題 · 8 分

(a) a = 5, b = −1

M1 f(1) = 0 gives a + b = 4; M1 f(−2) = 0 gives 4a − 2b = 22; M1 solves the pair; A1 a = 5; A1 b = −1.

(b) f(x) = (x − 1)(x + 2)(2x + 3)

M1 divides out one factor; A1 reaches (x − 1)(x + 2)(2x + 3); A1 all three factors correct.

第 9 題 · 8 分

(a) dy/dx = 18(3x − 1)⁵; at x = 1 the value is 576

M1 uses the chain rule; A1 18(3x − 1)⁵; M1 substitutes x = 1; A1 576.

(b) 6π ≈ 18.85 cm² per second

M1 dA/dr = 2πr; M1 multiplies by dr/dt; A1 6π; A1 cm² per second with correct units.

第 10 題 · 7 分

(a) AB = (3, 4); magnitude 5

M1 subtracts coordinates; A1 (3, 4); A1 5.

(b) (3/5, 4/5)

M1 divides AB by 5; A1 (3/5, 4/5).

(c) k = 6

M1 sets up k/3 = 8/4; A1 k = 6.

常見失分位

  • 配方法忘記先抽出係數 2,直接寫成 (x − 6)² − 29 之類的錯誤形式,最小值亦因此寫錯。
  • 三角方程只寫出 70.5° 一個解,漏掉 180° 與 289.5°,或寫出區間以外的解。
  • 面積題沒有先比較兩條曲線的高低,把積分次序倒轉,得出負面積。
  • 鏈式法則漏乘內層導數 3,答案變成 3(3x − 1)⁵ 而不是 18(3x − 1)⁵。
  • 相關變化率只寫出 12π 而沒有乘 dr/dt,或漏寫單位 cm² per second。

時間分配

題目 分數 建議時間
第 1–2 題 13 分 約 19 分鐘
第 3–4 題 15 分 約 22 分鐘
第 5–6 題 16 分 約 23 分鐘
第 7–8 題 16 分 約 23 分鐘
第 9–10 題 15 分 約 22 分鐘

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題目卷 PDF · 答案與評分要點 PDF

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