form 4 maths

2007-04-15 5:54 am
ST : TV = 2 : 5
SU : SV = 2 : 3

find SV : TU.

回答 (2)

2007-04-15 6:37 am
✔ 最佳答案
假設:S,T,U,V共線(colinear)
 S  T U   V
-+--+-+---+- (Not on scale,不按比例)

Let ST = 6k  <=[令下列的數值都成為整數]
ST : TV = 2 : 5
6k : TV = 2 : 5
  TV = 15k

And SV = ST + TV = 6k + 15k = 21k

As SU : SV = 2 : 3
  SU : 21k = 2 : 3
  SU = 14k

On the other hand, SV = ST + TU + UV
         21k = 6k + TU + 7k
         TU = 8k

Therefore, SV : TU = 21k : 8k
         = 21 : 8 //
參考: by My Maths
2007-04-15 6:20 am
Actually there is no TU in your question, do u mean TV?

if find SV:TU

ST/TV=2/5
5ST=2TV

SU/SV=2/3
2SV=3SU

so,
SV:TV
=SV/TV
=2SV/2V
=3SU/5ST
=3SU:5ST


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