2018年5月2日 星期三

DSE Core math 2018 分析


Paper 1
Section A1
Q1 Change subject, easy
Q2 indice, easy
Q3 round up/down/off, easy
Q4 simple probability, easy
Q5 Factorization, easy, 留意 part b 9r^2 – s^2 要再factorize, 技巧翻炒2015
Q6 inequality, easy
Q7 Percentage (cost, profit/loss, discount, selling price) 少少難, 因為冇分part a/b, ok, 可能會令能力稍遜的學生失分
Q8 Circles, concept is easy, 題型新穎, 因為沒有數字, 答案 in terms of theta, ok
Q9 Simultaneous equations cross over speed, 出得好, 留意分鐘和小時的單位轉換, 可能會令能力稍遜的學生失分

Section A2
Q10 Statistics (measures of dispersion)
Part a easy, part b 要試試下先會理解題目, 可能會令能力稍遜的學生失分

Q11 Statistics (mean, mode, median)
出得好, part b 係容易失分位 (但可以用不等式做的), 其餘四分穩袋

Q12 典型polynomial
Part b irrational root有點tricky, 應該有部分學生在這part判斷錯誤

Q13 Plane geometry
a)      Similar triangle, past paper常客, let 某隻角係y 就可以用AA係證
b)      All easy

Q14 Mensuration
Part b use similar ratio, all easy

Section B
Q15 P&C
新題型, 但唔難

Q16 ASGS
Part a 輕鬆
Part b 少少難, 翻炒2012 and 2013 last question, 但可以接受

Q17 3D trigo
a)      Sine formula, 輕鬆
b)      (i) cosine formula, 輕鬆
(ii) 攬炒

Q18 Variation + completing square + 四心
Part a, b i easy
Part b ii transformation of graph
Part c modified from 2015 Q18, 應該都ok

Q19 **, 一題定勝負
a)      大家都知道用deltatangent, 鬥爆數, xsubject應該做唔到, ysubject就會砌到, this is the biggest hurdle of this year’s paper 1

b)      (i) 做得part a 的話, part冇難度, 但值得留意的係, 做唔到part a , 因為佢而家話左D的座標比你聽, 你係可以起死回生的………….

(ii) inscribed circle, in-centre, angle bisectors, tangent properties, not difficult actually, but 6 marks ar…….


Paper 2
Section A
Q1 indice, easy
Q2 change subject, easy
Q3 factorization, 要調位先, easy
Q4 rational function, easy
Q5 quadratic function and graph, easy
Q6 difficult straight line MC, 早左出現, 建議飛左先
Q7 function, cut and paste, easy
Q8 polynomial, easy
Q9 compound interest, easy
Q10 ratio, easy
Q11 variation, easy
Q12 simple sequence, 少少難
Q13 compound inequality, easy
Q14 error, upper limit lower limit……..
Q15 volume of prism, easy
Q16 ratio geometry, this year is easy comparatively…
Q17 difficult plane geometry 1. wow! 要用similar triangles幫手計
Q18 plane geometry 2. Wow! 要用congruent triangles幫手計
Q19 difficult plane geometry 3. wow! Wow!
Q20 difficult plane geometry 4. wow! 要用similar triangles幫手計 or trigo
Q21 wow, trigo
Q22 circle, easy comparatively..
Q23 easy, rotational symmetry
Q24 polar coordinate, need to draw graph
Q25 locus, easy
Q26 straight line, need to draw graph
Q27 equation of circle, easy
Q28 probability, you may draw table, ok easy
Q29 find mean, easy
Q30 IQR.. 少少難

Section B
Q31 transformation of graph, ok
Q32 log graph, 少少難
Q33 log straight line graph, ok
Q34 linear programming, fxxk, 要畫圖, 仲要唔易畫, crazy
Q35 ASGS, easy
Q36 sum of roots/ product of roots, ok
Q37 imaginary number, ok
Q38 trigo equation, easy
Q39 circle, angle in alt. segment, ok
Q40 4 centres, need to draw graph, 少少難
Q41 又係呢d 3D trigo, 少少難
Q42 P&C, easy
Q43 probability + GS, modified from 2014 paper 1 Q19
Q44, standard score, easy
Q45 variance, 出得有新意, ok ar

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