IGCSE 數學 0580 Paper 2 練習卷(Extended・不準用計算機)|19 題 100 分附答案詳解
- 2026-10-29
題目用英文書寫,與實際劍橋試卷一致;評分要點、解題步驟與等級描述用中文說明。
原創 IGCSE 數學 0580 Extended Paper 2 練習卷:2 小時、100 分、不準用計算機,19 題涵蓋標準式、百分數、比例尺、根式、二次方程、三角面積、統計表、函數、向量與證明,附答案詳解、評分要點與等級描述。
Section A — 短題目(第 1–10 題)
Section A 是短題目,考核基本運算與公式運用,每題 4–5 分,目標是在 50 分鐘內完成並保持準確。
1. Answer all three parts without a calculator.
(a) Write 0.000 046 in standard form. (1 分)
(b) Work out 3/4 + 5/6, giving your answer as a fraction in its simplest form. (2 分)
(c) Work out (2.4 × 10⁶) × (5 × 10⁻³), giving your answer in standard form. (1 分)
2. A laptop has a normal price of $640. In a sale the price is reduced by 15%.
(a) Work out the reduction, in dollars. (1 分)
(b) Work out the sale price of the laptop. (1 分)
(c) After the sale the shop raises the sale price by 10%. Work out the new price and the percentage change from the normal price. (2 分)
3. A map is drawn to a scale of 1 : 25 000.
(a) On the map a road is 6.4 cm long. Work out the real length, in km. (2 分)
(b) A field is 1.8 km long. Work out its length on the map, in cm. (2 分)
(c) Work out the real area, in m², represented by 1 cm² on the map. (1 分)
4. Do not use a calculator.
(a) Work out 27^(2/3). (2 分)
(b) Simplify √50 + √18, giving your answer in the form k√2. (2 分)
5. The first four terms of a sequence are 5, 11, 17, 23, …
(a) Find the nth term of the sequence. (2 分)
(b) Find the 40th term. (1 分)
(c) Explain whether 200 is a term of this sequence. (1 分)
6. Show your working for each part.
(a) Expand and simplify (2x − 3)(x + 5). (2 分)
(b) Factorise completely 6x² − 15x. (1 分)
(c) Factorise x² − 9. (1 分)
7. Show all your working.
(a) Solve the simultaneous equations 3x + 2y = 16 and x − y = 2. (3 分)
(b) Make x the subject of 5y − 3x = 10. (2 分)
8.
(a) Work out the interior angle of a regular pentagon. (2 分)
(b) Write down the exterior angle of a regular pentagon. (1 分)
(c) The interior angle of a regular polygon is 156°. Work out the number of sides. (2 分)
9. All lengths are in cm. Give exact answers where possible.
(a) A right-angled triangle has hypotenuse 13 cm and one side 5 cm. Work out the third side. (2 分)
(b) In a right-angled triangle the hypotenuse is 14 cm and one angle is 30°. Work out the side opposite the 30° angle. (1 分)
(c) Work out the side adjacent to the 30° angle in part (b), in the form k√3. (2 分)
10. A bag contains 5 red, 3 blue and 2 green counters. All the counters are different. Two counters are taken at random without replacement.
(a) Write down the probability that the first counter is red. (1 分)
(b) Work out the probability that both counters are red. (2 分)
(c) Work out the probability that at least one counter is green. (2 分)
Section B — 長題目(第 11–19 題)
Section B 是長題目,需要寫出完整方法,包括二次方程、立體圖形、統計表、三角面積、函數、向量與證明。
11. Show your method for both parts.
(a) Solve 2x² − 7x + 3 = 0, showing your factorisation. (3 分)
(b) Write x² − 6x + 5 in the form (x − a)² + b, and state the coordinates of the minimum point of y = x² − 6x + 5. (3 分)
12. The line L passes through A(2, 5) and B(6, 13).
(a) Work out the gradient of L. (2 分)
(b) Find the equation of L in the form y = mx + c. (2 分)
(c) Find the x-intercept of L. (1 分)
(d) Explain whether the point (10, 21) lies on L. (1 分)
13. A closed cylinder has radius 7 cm and height 10 cm. Use π = 22/7.
(a) Work out the volume of the cylinder, in cm³. (3 分)
(b) Work out the curved surface area, in cm². (2 分)
(c) Work out the total surface area of the closed cylinder, in cm². (2 分)
14. In a sale a bicycle is sold for $272 after a 20% discount.
(a) Work out the normal price of the bicycle. (3 分)
(b) A shop assistant adds 20% to $272 and says this is the normal price. Explain, with figures, why this is wrong. (3 分)
15. The table shows the number of goals scored by a football team in each of its matches this season.
(a) Work out the mean number of goals per match. (3 分)
(b) Work out the median number of goals. (2 分)
(c) Write down the mode. (1 分)
(d) How many matches had 3 or more goals? (1 分)
| x | 0 | 1 | 2 | 3 | 4 |
|---|---|---|---|---|---|
| f | 4 | 9 | 12 | 3 | 2 |
每場入球數(x)與場數(f)
16. Triangle ABC has AB = AC = 8 cm and angle BAC = 60°.
(a) Show that BC = 8 cm. (2 分)
(b) Work out the area of triangle ABC, in the form k√3 cm². (2 分)
(c) The triangle is the cross-section of a prism of length 12 cm. Work out the volume of the prism, correct to 3 significant figures. (3 分)
17. f(x) = 3x − 2 and g(x) = x² + 1.
(a) Find f⁻¹(x). (2 分)
(b) Work out gf(2). (2 分)
(c) Explain whether f(x) = g(x) has any real solutions. (2 分)
18. In triangle OAB, OA = a and OB = b. P is the midpoint of OA. Q lies on AB with AQ : QB = 1 : 3.
(a) Find PQ in terms of a and b, in its simplest form. (3 分)
(b) M is the midpoint of AB. Show that PQ is parallel to OM and state the ratio PQ : OM. (3 分)
19. Answer both parts.
(a) Solve the inequality 4 − 3x < 13. (2 分)
(b) n is an integer. Prove that n² + n is always an even number. (2 分)
評分準則(全卷 100 分)
| 題目 | 考核內容 | 分數 | 主要得分位 |
|---|---|---|---|
| 1 | 數字與標準式 | 4 | (b) 2 分:通分母 12 得 1 分,19/12 得 1 分;答 1.58… 不給分。 |
| 2 | 百分數 | 4 | (c) $598.40 得 1 分,−6.5% 得 1 分(寫「減少 6.5%」接受);答 −10% 或 −15% 不給分。 |
| 3 | 比例與比例尺 | 5 | (c) 最常見錯誤是用 25 000 而非 25 000²;答案單位必須是 m²。 |
| 4 | 指數與根式 | 4 | (a) 27^(1/3) = 3 得 1 分,9 得 1 分;(b) 化簡其中一個根式得 1 分,8√2 得 1 分。 |
| 5 | 數列 | 4 | (c) 理由要指出 n 不是整數;只寫「不是」不給分。 |
| 6 | 代數運算 | 4 | (a) 未化簡前四項正確得 1 分,2x² + 7x − 15 得 1 分;(b) 必須抽 3x,只抽 x 不給分。 |
| 7 | 方程與主項變換 | 5 | (a) 代入或消元正確得 1 分,y = 2 得 1 分,x = 4 得 1 分;(b) 整理出 3x 得 1 分,整式除 3 得 1 分。 |
| 8 | 多邊形角 | 5 | (c) 用外角最穩;直接用 156° 去除 360° 不給分。 |
| 9 | 畢氏定理與三角比 | 5 | (c) 本卷不准用計算機,必須寫根式;若同時寫出根式,可接受 12.1。 |
| 10 | 概率 | 5 | (b) 第二次要抽 4/9;兩次都用 5/10 只給 1 分。 |
| Section A 小計 | 45 | ||
| 題目 | 考核內容 | 分數 | 主要得分位 |
|---|---|---|---|
| 11 | 二次方程與配方法 | 6 | (a) 正確因式得 1 分,每個根各 1 分;(b) (x − 3)² − 4 得 2 分,座標得 1 分。 |
| 12 | 直線方程 | 6 | (d) 要寫出代入過程;只寫「是」不給分。 |
| 13 | 立體圖形 | 7 | (a) 代入 πr²h 得 1 分,22/7 × 49 = 154 得 1 分,1 540 得 1 分;(c) 兩個圓底要計兩次。 |
| 14 | 逆算百分數 | 6 | (a) 應除以 0.8(或先除 80 再乘 100);272 × 1.2 不給分。(b) 兩個數字都對得 2 分,指出「基數不同」得 1 分。 |
| 15 | 統計 | 7 | (a) Σfx = 50 與 Σf = 30 得 2 分,5/3(接受 1.67)得 1 分;誤除以 5(行數)不給分。 |
| 16 | 三角面積與體積 | 7 | (a) 應用餘弦定理並代入 cos 60° = 1/2;”show that” 題必須寫過程。(c) 192√3 得 2 分,取 3 位有效數字得 1 分。 |
| 17 | 函數 | 6 | (b) gf 即 g(f(x)),先做 f;答 37 不給分。(c) 要算出判別式並解釋。 |
| 18 | 向量 | 6 | (a) OQ 得 1 分,相減得 1 分,¼a + ¼b 得 1 分;(b) 證明平行要指出純量倍數 ½。 |
| 19 | 不等式與證明 | 4 | (a) −3x < 9 得 1 分,x > −3 得 1 分(寫 x < −3 不給分)。(b) 要寫出因式分解與「連續整數」的論證。 |
| 全卷總分 | 100 | ||
| 等級 | 分數 | 描述 |
|---|---|---|
| A* | 85–100 | 計算準確、方法直接,長題目(如向量、立體圖形、證明)能完整寫出推理,並正確處理有效數字與單位。 |
| A | 75–84 | 大部分題目方法正確,僅在長題目末段或精確值(根式、分數)出現小錯。 |
| B | 65–74 | 基本運算穩定,但二次方程、三角面積、向量比例等題型會漏步驟或混淆公式。 |
| C | 55–64 | 能完成短題目,長題目多只能取部分分;百分數逆算、統計平均等概念未穩。 |
| D/E | 0–54 | 基礎運算與公式記憶未達 Extended 要求,建議先鞏固 Core 內容再操卷。 |
| 階段 | 分鐘 |
|---|---|
| 閱讀全卷、分配時間 | 5 |
| Section A(第 1–10 題) | 50 |
| Section B(第 11–19 題) | 55 |
| 覆核:單位、有效數字、代回驗算 | 10 |


