# Quod Erat Demonstrandum

## 2008/12/04

### 中一數學題：短加長減

Filed under: Junior Form Mathematics — johnmayhk @ 3:56 下午

(a) 試根據上表資料及你的常識，說明二○○八年十二月二日的士堵塞機場事件的因由。
(b) 設 $x$ = 錶示舊收費，$y$ = 新收費，請根據上表資料寫出一些等式表示 $x$$y$ 的關係。

## 2 則迴響 »

1. X’s starting point is \$16.0
Y’s starting point is \$18.0
y added \$1.5 per 0.2km before the price was over \$70.
y added \$1.0 per 0.2km after the price was over \$70.

Before the price was over \$70:
Let n be the numbers of the term(not include the starting point)
16+n(1.4)=x
18+n(1.5)=y
the different of the starting point is 2 (18-16)
And the different price increase 0.1n.
2+0.1n=the different (y-x)

After the price was over \$70
Let r be the term that after y is over 70!
x=63.6 y=69.0
63.6+r(1.0)=x
69.0+r(1.4)=y
the different of the starting point is 5.4(69.0-63.6)
And the different increasae0.4r
5.4+0.4r=the different (x-y)

Hey! Mr.Ng!I think i can’t finish WS1-22!I just do you told me la~ I am doing other exercise!

迴響 由 byronxgalilee — 2008/12/04 @ 10:15 下午 | 回應

2. Sorry! There is an typing error! I just do you told me la->I just finish the question that you told us!

迴響 由 byronxgalilee — 2008/12/04 @ 10:16 下午 | 回應