數學試卷答案:P=2, Q=6a) 3(4x + 7y)(4x - 7y)b) 2z(4x -7y)c) (4x - 7y)(12x + 21y - 2z)a) a : b = 8 : 15b) 31 : 17a) (y=dfrac{3x}{5x-2})b) (y=dfrac{3P}{5P-1})a) (dfrac{ab}{2(b-a)})b) (dfrac{4x}{(x-3)(x-1)})a) 1 mmb i) 7208.01 cm2b ii) 7242.01 cm2b iii) 7208.0...
這題解聯立方程的題目除考大家識唔識解聯立方程之外，仲考驗大家識唔識得變通。解b部的重點在於留意到b部中的兩條方程其實與a部的方程基本上係一樣的,只係把x、y改寫成 (dfrac{1}{a})及(dfrac{1}{b})。a) (begin{align}&quad 2x-5y=-3 ...... (1) \&quad 3x+y=1 ...... (2) \&(2)times 5:\&quad 15x+5y=5 ...... (3) \&(1)+(3):\&a...
Consider △CPB and △BPM, ∠CPM = ∠BPM = 90º (given) ∠PMB = 180º - ∠BPM - ∠PBM = 90º - ∠PBM ∠PBC = ∠MBC - ∠PMB = 90º - ∠PBM ∴, ∠PMB = ∠PBC Therefore, △CPB ∼ △BPM (A.A.A. ∼). Now, consider △CPD and △BPN, ∠DCP = ∠DCB - ∠P...