F.1數學.........

1. 佢答錯左8題
2. 324
3. 4%
4. 2500
5. 單利息: 3200元 本利和: 43200
6. 8年
7. (a) 2800元
(b) 26%

2007-02-14 09:40:48 補充：
以下既係條式1. 16x5=80將80-56=2424除3= 82. 900x36%=3243. 36除900=0.040.04x100%=4%4. X乘36%=900 X=25005. 單利息=40000x0.02x4本利和=單利息 400006. Tx12500x0.045=17000 T=87. (a) 2000x(1 0.4)=2800(b)2800x0.9=25202520-2000=520520除2000=0.260.26x100%=26%

2007-02-14 09:44:00 補充：
列式補充5. 本利和=單利息加400007. (a) 2000x(1.04)=2800

1. 假設答錯了的題目是 x

16 × 5 - X × 3 = 56
3X = 80 - 56
X = 8

小新答錯了8題。


2. 900的36%是:
900 × 36% = 324



3. 36是900的百分之幾?

36 / 900 × 100% = 4%



4. X的36%是900,求X的值.

900 ÷ 36% = 2500



5. 一筆款項 $40 000以2%的年利率存放4年,求單利息和本利和.

$40,000 × + $40,000 × 2% × 4 = $43,200


6. 子明把 $12 500存入銀行,年利率是4.5%.如果按單利息計算T年後所得的本利和是 $17 000,求T的值.


($17,000 - $12,500) ÷ ($12,500 × 4.5% ) = 8


7. 一部成本是 $2 000的攝影機,以盈利40%定出標價.
(A)求這部攝影機的標價.
(B)如果這部攝影機以10%的折扣百分率售出,盈利百分率是多少?

7(A) $2,000 × (1 + 40%) = $2,800
7(B) [ $2,800 × (1-10%) ÷ $2,000 -1 ] × 100% = 26%

1
let we have x answer correct, y answer wrong
x+y=16 -(1)
5x-3y=56 -(2)
(1)X3 + (2)
8x=104
x=13
Sub x=13 into (1)
y=3

2
900X36%
900X36
=--------------
100
=9X36
=324

3,
36X900%
36X9
324

4,
x X36%=900
100
x=900X---------
36
x=2500

5,
P=40000,r=2%,t=4
I=Prt
I=40000X0.02X4
=3200
本利和=I+P=43200

6,
P=12500,r=0.045,t=T
I=17000-12500=4500
I=Prt
4500=12500X0.045XT
T=8

7
a, price=2000X(1+40%)=2000X1.4=2800
b, selling price= 2800X(1-10%)=2800X 0.9 =2520
profit%=(2520/2000)X100%=126%

2007-02-15 22:06:40 補充：
第一條,可以被人challenage,
你點知一定係岩左16條?
so要用數字表達出黎,
應該用兩條式兩個unknown解,