2012-I-17
Ans: (a) $(x-6)^2+(y-10)^2=10^2$ (b) $\left(\dfrac{k-4
… Read HKDSE-MATH
2012-II-01
Ans: C
$\begin{array}{cl}
& \dfrac{(2x^4)^3}{2x^5
… Read $\begin{array}{cl}
& \dfrac{(2x^4)^3}{2x^5
2012-II-02
Ans: D
$\begin{array}{cl}
& (4x+y)^2-(4x-y)^2 \\
= &
… Read $\begin{array}{cl}
& (4x+y)^2-(4x-y)^2 \\
= &
2012-II-03
Ans: C
$\begin{array}{rcl}
x^2 + p & \equiv & (x+
… Read $\begin{array}{rcl}
x^2 + p & \equiv & (x+
2012-II-04
Ans: B
Let $f(x)=x^3+4x^2+kx-12$.
… Read Let $f(x)=x^3+4x^2+kx-12$.
Since $f(x)$ is divisib
2012-II-05
Ans: B
$\left\{\begin{array}{ll}
m+2n+6=7 & \ldots
… Read $\left\{\begin{array}{ll}
m+2n+6=7 & \ldots
2012-II-06
Ans: D
Consider the equation $y=a(x+b)^2$.
… Read Consider the equation $y=a(x+b)^2$.
The sign of $a$ r
2012-II-07
Ans: C
$\begin{array}{rcl}
15+4x & < & 3 \\ 4x & < & -12 \\ x & < & -3 \end{array}$
… Read $\begin{array}{rcl}
15+4x & < & 3 \\ 4x & < & -12 \\ x & < & -3 \end{array}$
Also,
$\begin{ar
2012-II-08
Ans: D
The percentage of married employees in the company
… Read The percentage of married employees in the company
$\
2012-II-09
Ans: A
$\begin{array}{rcl}
\dfrac{6x+5y}{3y-2x} &
… Read $\begin{array}{rcl}
\dfrac{6x+5y}{3y-2x} &
2012-II-10
Ans: D
$y=k_1x^2+\dfrac{k_2}{x}$, where $k_1$ and $k_2$ a
… Read $y=k_1x^2+\dfrac{k_2}{x}$, where $k_1$ and $k_2$ a
2012-II-11
Ans: C
Total words she typed in the first $3$ hours
… Read Total words she typed in the first $3$ hours
$\begin{a
2012-II-12
Ans: B
$\begin{array}{rcl}
T(1) & = & 1 \\
T(2) &#
… Read $\begin{array}{rcl}
T(1) & = & 1 \\
T(2) &#
2012-II-13
Ans: D
$\begin{array}{cl}
& 0.032~251~5 \\
= & 0
… Read $\begin{array}{cl}
& 0.032~251~5 \\
= & 0
2012-II-14
Ans: B
Note that the possible greatest length of the thin str
… Read Note that the possible greatest length of the thin str
2012-II-15
Ans: A
In $\Delta ADC$,
… Read In $\Delta ADC$,
$\begin{array}{rcl}
AC & = �
2012-II-16
Ans: B
Let $\angle AOB=\theta$.
… Read Let $\angle AOB=\theta$.
Consider the sector $OAB$,
2012-II-17
Ans: B
Join $AF$.
… Read Join $AF$.
Since $\Delta DFG$ and $\Delta DFA$ have th