2021-II-21
Ans: D
… Read I is true.
$\begin{array}{rcl}
\angle ABC & = &#
HKDSE-MATH - 2021 - Paper 2
2021-II-22
Ans: A
… Read $\begin{array}{rcll}
\angle ACD & = & 180
2021-II-23
Ans: B
… Read $P(7,-5)$ is reflected with respect to the $y$-axis t
2021-II-24
Ans: D
… Read In $\Delta ACD$,
$\begin{array}{rcll}
\tan \theta &
2021-II-25
Ans: C
… Read Let $(x,y)$ be the coordinates of $P$. Then the equati
2021-II-26
Ans: A
… Read Since $AP$ is a median of $\Delta ABC$, then $P$ is the m
2021-II-27
Ans: C
… Read Let $C$ be the centre of the circle. Then the coordinat
2021-II-28
Ans: D
… Read Note that there are $24$ workers. Then the lower quart
2021-II-29
Ans: B
… Read The inter-quartile range
$\begin{array}{cl}
=
2021-II-30
Ans: A
… Read Let $\mu$ be the mean of the remaining $40$ integers.
$
2021-II-31
Ans: A
… Read $\begin{array}{rcl}
\text{The $1$st expression} &
2021-II-32
Ans: D
… Read $\begin{array}{cl}
& 14\times 16^{15} +17 \ti
2021-II-33
Ans: C
… Read Sub. $y=0$ into $y=a+\log_b x$, we have
$\begin{arra
2021-II-34
Ans: C
… Read Consider the equation of the straight line, we have
$\
2021-II-35
Ans: A
… Read I must be true. For any real number $\alpha$,
$\begin{
2021-II-36
Ans: A
… Read I must be true. Since $p$, $q$, $r$ and $s$ is a geometri
2021-II-37
Ans: B
… Read For any real number $x$, $x^2+kx+k+8\ge 0$. Then we ha
2021-II-38
Ans: B
… Read Add a point $X$ on $CD$ such that $EX \perp CD$. Hence, $
2021-II-39
Ans: D
… Read Join $AD$.
In $\Delta CDE$,
$\begin{array}{rcll}
\a
2021-II-40
Ans: A
… Read $\left\{ \begin{array}{l}
x^2 +y^2 -4x -22y +75 = 0 &#