Solving Master
Resources for HKDSE Mathematics
$\begin{array}{cl} &
$\left\{ \begin{array}{l} x+y =456 & \ldots
$\begin{array}{cl}
設 $\$x$ 為該風扇的標價。
該風扇的售價
$\begin{array}{cl} = &
$\begin{array}{rcl} -2(3x+2)
$\begin{a
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