查看完整版本 : 簡單但我唔識。求耐心解答

marimeow 2018-11-3 08:32 PM

簡單但我唔識。求耐心解答

1/2(1+60%)h * (1-x%)b = 1/2hb(1+20%)
已經唔明點變成
1.6(1-x/100)hb = 1.2hb 

1/2hb(1+20%) 點化做 1.2hb 

ppresent 2018-11-4 10:29 AM

條式係
[img]https://latex.codecogs.com/gif.latex?%5Cfrac%7B1%7D%7B2%281+60%5C%25%29h%7D%20%281-x%5C%25%29b%20%3D%20%5Cfrac%7B1%7D%7B2hb%281+20%5C%25%29%7D[/img]?
定係
[img]https://latex.codecogs.com/gif.latex?%5Cfrac%7B1%7D%7B2%281+60%5C%25%29h%20%281-x%5C%25%29b%7D%20%3D%20%5Cfrac%7B1%7D%7B2hb%281+20%5C%25%29%7D[/img]?

如果是下面條式,咁交叉相乘之後就係
[img]https://latex.codecogs.com/gif.latex?%7B2hb%281+20%5C%25%29%7D%20%3D%20%7B2%281+60%5C%25%29h%20%281-x%5C%25%29b%7D[/img]
約去2之後,調番轉左右亦即

[img]https://latex.codecogs.com/gif.latex?%7B1.6%20%281-%5Cfrac%7Bx%7D%7B100%7D%29hb%7D%20%3D%20%7B%281.2%29hb%7D[/img]

halola 2018-11-5 03:11 PM

[quote]原帖由 [i]marimeow[/i] 於 2018-11-3 08:32 PM 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=489975813&ptid=27826189][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
1/2(1+60%)h * (1-x%)b = 1/2hb(1+20%)
已經唔明點變成
1.6(1-x/100)hb = 1.2hb 

1/2hb(1+20%) 點化做 1.2hb  [/quote]


1/2(1+60%)h * (1-x%)b = 1/2hb(1+20%)
已經唔明點變成
1.6(1-x/100)hb = 1.2hb 

1/2hb(1+20%) 點化做 1.2hb 

係咁嘅:
1/2(1+60%)h * (1-x%)b = 1/2hb(1+20%)
上式,兩邊同除以1/2,即消去1/2
1+60%=1.6
1+20%=1.2
x%=x/100
所以上式可寫作
1.6(1-x/100)hb = 1.2hb 
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