Yahoo!奇摩股市 - 期貨外匯
Yahoo!奇摩股市
新台幣中午升1.66角
Jun 24th 2013, 04:03

新台幣中午升1.66角
2013/06/24 12:03 中央社

(中央社台北2013年6月24日電)台北外匯市場新台幣兌美元匯價今天中午收盤升1.66角,達30.114元,成交金額5.52億美元。

新台幣兌美元今天開盤價為30.300元,盤中最高30.055元、最低30.310元。

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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
二次不等式不會
Jun 24th 2013, 00:27

1. 2x²+4x-3無法十字交乘,先令2x²+4x-3=0

用公式解得x= -1±√10/2

[x-(-1-10/2)][x-(-1+10/2) > 0

x < -1-10/2 or x > -1+10/2 

 

2. 先將-x²+3x+5 > 0改為x²-3x-5 < 0

用上一題的方法找出x=(3±√29)/2

[x-(3-29)/2][x-(3+29)/2] < 0

(3-29)/2 < x < (3+29)/2 

 

3. 4x²-4x+1 > 0

(2x-1)² > 0

x為任意實數,但x1/2 

 

4. 3x²-5x-2 < 0

(x-2)(3x+1) < 0

-1/3 < x < 2 

 

5. 4x²-4x+5 < 0

此為開口向上的拋物線

但判別式b²-4ac=16-80< 0,表示4x²-4x+5=0無解,表示拋物線碰不到x(x軸無交點)。拋物線開口向上又和x軸無交點,所以4x²-4x+5恆正,

因此4x²-4x+5 <0無解 

 

6. x²+2x+4 > 0

也是開口向上的拋物線且判別式小於0為恆正,

因此x²+2x+4 >0x可為任意實數 


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Yahoo!奇摩知識+ - 分類問答 - 電腦網路 - 發問中
Yahoo!奇摩知識+ - 分類問答 - 電腦網路 - 發問中
foxy win7一直顯示尚未連線的藍色
Jun 23rd 2013, 19:31

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電腦系統 win7 旗艦版64位元、FOXY 1.9.10 開啟時右下角一直顯示尚未連線的藍色、請問有什麼方法可以解決? 其他版本 1.8.6、1.8.7 那些也都不行、1.9.9免安裝那種也都不行......
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