係數學高手的話.......請come

首先，問題有病。ku...1)應是
絲帶3米,綑紮禮物用去40%;做絲帶花一朵後餘下絲帶0.75米,做絲帶花用去絲帶幾多米？ku....
1)做絲帶花用去絲帶
3x(1-40%)-0.75
=3x60%-0.75
=1.8-0.75
=1.05(米)
2)這長方形的闊是長的百分率
(1/125%)x100%
=(1/1.25)x100%
=80%
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kururu名言：用下個腦筋想想，難題就易解開了！ku.....
kukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukukuku

好明顯係功課題，仲要係小學的，幫佢做基本上等於害佢。

1)
3x40%
=3x0.4
=1.2(米)
設做絲帶花所用去的絲帶n米
1.2-n=0.75
1.2-0.75=n
n=0.45

2)
100/125x100%
=80%

2007-02-24 13:57:46 補充：
第1題我睇錯題目...sor應該係1)設做絲帶花所用去的絲帶n米3x60%-n=0.751.8-n=0.751.8-0.75=nn=1.05

1) Let the belt left y metre.
[3x(1-40%)]-y=0.75
3x60%-y=0.75
3x0.6-y=0.75
1.8-y=0.75
1.8-0.75=y
y=1.05

The belt left 1.05 metre.

2) Let the width is 100 cm.
The lengh is 125cm.
The width is 100cm.
So,
100/125](100%)
=4/5(100%)
=80%

So, the width is 80% of the lengh.

1) 3*(1-40%) - y = 0.75
-y = 0.75 - 1.8
y = 1.05
做絲帶用去絲帶 1.05米

2) y*125% = z
y = z*100/125
y = z* 80/100
y = z*80%
長方形的闊是長的80%

1) After the use of silk belt by 40%, the silk belt has 3x(1-40%) = 1.8m long.

Let the length of silk belt used for making a flower be x m.

Then, 1.8 - x = 0.75
=> x = 1.8 - 0.75 = 1.05
i.e. 1.05m of the silk belt is used for making the flower.

2) Let the length and width of the rectangle be x and y respectively.

Then, x/y = 125% or 1.25. Therefore y/x = 1/1.25 = 0.8 or 80%

1.
(3x0.6)-Y=0.75
1.8-Y=0.75
1.8-0.75=Y
Y=1.05M




2.
1÷1.25=8

=80%