8.The ratio of the length to the width of a rentangle is 4:3.If the perimeter of the rectangle is 42cm, find the lenth of the rectangle.
9.If the ratio of the perimeter ofsquare A to that of square B is 3:5, find the ratio of the side of square A to that of square B.
以上兩題計到但係唔識寫式......即係有概念但唔知點寫題解
仲有,有咩網站有關於 Rate and Ratio 的 Exercise or Example 比我做下咁!?
Thank you very much!
Rate and Ratio
2007-01-15 12:01 am
回答 (2)
2007-01-15 12:19 am
✔ 最佳答案
8.let x cm and y cm be the length to the width of a rentangle respectively3x=4y
x=4/3y
2(x+y)=42
x+y=21
4/3y+y=21
7/3y=21
y=9
x=12
-----------------------------------------------------------------------------------------------------------
呢條問得好怪
perimeter係周界bo~
9.Let the side of square A and square B be x cm and y cm
4x:4y=3:5
x:y=3/4:5/4
x:y=3:5
2007-01-14 16:24:42 補充：
上面果個人有問題唔好信佢信者死得點使開方啊
參考: me
2007-01-15 8:52 am
(8) First of all, the length=4/7(length+width)
As the perimeter of the rectangle is 42cm, then length+width=42/2=21cm
Therefore, the length=4/7(21)=12cm
(9) If the ratio of the perimeter of square A to that of square B is 3:5,
then the ratio of side of square A to that of square is also 3:5.
As the perimeter of the rectangle is 42cm, then length+width=42/2=21cm
Therefore, the length=4/7(21)=12cm
(9) If the ratio of the perimeter of square A to that of square B is 3:5,
then the ratio of side of square A to that of square is also 3:5.
收錄日期: 2021-04-13 14:43:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070114000051KK02985