form 4 maths - variation
2010-04-17 5:49 am
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solve the above question detailed.THANKS!
回答 (2)
2010-04-17 6:49 am
✔ 最佳答案
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2010-04-16 22:51:21 補充：
Correction:
http://i.imagehost.org/0986/ScreenHunter_06_Apr_16_22_50.gif
2010-04-16 22:52:27 補充：
19a)z=4x+ (24/開方y)
(b)x=5
2010-04-17 6:54 am
p∝x ⇒ p=hx
q∝1/√y ⇒ q=k/√y
z=p+q
=hx+k/√y
For x=3 , y=4 and z=24: 6h+k=48____(1)
For x=−1 , y=36 and z=0: −6h+k=0___(2)
(1)−(2): 12h=48 ⇒ h=4 ∴k=24
z = 4x + 24/√y
When z=26 and y=16:
26=4x+(24/4)
x=5
q∝1/√y ⇒ q=k/√y
z=p+q
=hx+k/√y
For x=3 , y=4 and z=24: 6h+k=48____(1)
For x=−1 , y=36 and z=0: −6h+k=0___(2)
(1)−(2): 12h=48 ⇒ h=4 ∴k=24
z = 4x + 24/√y
When z=26 and y=16:
26=4x+(24/4)
x=5
收錄日期: 2021-04-23 20:46:41
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100416000051KK01494