2007-II-13
Ans: A
$\begin{array}{rcl}
7a + 5b & = & 3a + 8b \\
4
… Read $\begin{array}{rcl}
7a + 5b & = & 3a + 8b \\
4
HKCEE
2007-II-14
Ans: B
Let $y = k_1 + k_2 x$, where $k_1$ and $k_2$ are constant
… Read Let $y = k_1 + k_2 x$, where $k_1$ and $k_2$ are constant
2007-II-15
Ans: C
… Read $\begin{array}{rcl}
\alpha + 110^\circ & = �
2007-II-16
Ans: A
Let $OA=r\text{ cm}$. Then we have
… Read Let $OA=r\text{ cm}$. Then we have
$\begin{array}{r
2007-II-17
Ans: A
The base area of the right prism
… Read The base area of the right prism
$\begin{array}{cl}
=
2007-II-18
Ans: B
Note that the volume is conserved. Then we have
… Read Note that the volume is conserved. Then we have
$\begi
2007-II-19
Ans: A
Consider $\Delta CDF$ and $\Delta CBF$. With bases $F
… Read Consider $\Delta CDF$ and $\Delta CBF$. With bases $F
2007-II-20
Ans: D
Since $x+y=90^\circ$, we have $x = 90^\circ – y
… Read Since $x+y=90^\circ$, we have $x = 90^\circ – y
2007-II-21
Ans: D
$\begin{array}{cl}
& \dfrac{\cos A}{\sin A} +
… Read $\begin{array}{cl}
& \dfrac{\cos A}{\sin A} +
2007-II-22
Ans: D
$\begin{array}{rcl}
\sin\theta & = & \sq
… Read $\begin{array}{rcl}
\sin\theta & = & \sq
2007-II-23
Ans: B
In $\Delta ABC$,
… Read In $\Delta ABC$,
$\begin{array}{rcl}
\angle ABC �
2007-II-24
Ans: D
Note that the line of intersection of planes $ABC$ and
… Read Note that the line of intersection of planes $ABC$ and
2007-II-25
Ans: C
I has no rotational symmetry.
… Read I has no rotational symmetry.
II has $4$-fold rotatio
2007-II-26
Ans: B
The axes of reflectional symmetry of the square $ABCD
… Read The axes of reflectional symmetry of the square $ABCD
2007-II-27
Ans: D
Note that the sum of the exterior angles of polygon is $
… Read Note that the sum of the exterior angles of polygon is $
2007-II-28
Ans: B
Add a straight line $FX$ such that \\ $AB//FX//CD$. Si
… Read Add a straight line $FX$ such that \\ $AB//FX//CD$. Si
2007-II-29
Ans: C
The image of rotating the point $(3,-2)$ clockwise ab
… Read The image of rotating the point $(3,-2)$ clockwise ab
2007-II-30
Ans: C
… Read Note that $x=1$ and $y=1$. Hence, we have
$\begin{arr
2007-II-31
Ans: D
Let $m$ be the slope of the required straight line.
… Read Let $m$ be the slope of the required straight line.
Not
2007-II-32
Ans: A
Note that the slope and the $y$-intercept of the strai
… Read Note that the slope and the $y$-intercept of the strai