Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
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複數的極式與幾何意義
Aug 23rd 2013, 17:36

1.試將下列各式化為極式

(1) cos320°-i*sin220°

=cos(360-40)-j*sin(180+40);;j=i

=cos40+jsin40

=e^(2πj/9)

其中40π/180=2π/9


(2) cos507°-i*sin327°

=cos(360+147)-j*sin(180+147)

=cos147+j*sin147

=e^(49πj/60)

其中147π/180=49π/60

(3) -(sin18°+j*cos18°)

=-(sin(90-72)+j*cos(90-72))

=-(cos72+j*sin72)

=-e^(2π/5)

其中72π/180=2π/5


(4) sin125°+i*cos235°

=sin(90+35)+j*cos(270-35)

=cos35-jsin35

=e^(-7π/36)

其中35π/180=7π/36


2.設z=2(cosπ/3+i*sinπ/3),求Arg(i●z)=?

Ans: j=i

j=(cos90+j*sin90)=e^(πj/2)

j*z=e^(πj/2)*2*e^(πj/3)=2e^(5πj/6)

Arg(j*z)=5π/6=150°


3.z1=-2+i, z2=3-i, Arg(z1)=θ1,Arg(z2)=θ2 ,則w3=Arg(z1)+Arg(z2)=?

Ans: Q=θ

Q1=atan(1/-2)=153.435°

r1=√(1+4)=√5

z1=√5(-2/√5+j/√5)

=√5(cos(153.435)+jsin(153.435))

Arg(z1)=153.435°

Q2=atan(-1/3)=-18.435°

r2=√(9+1)=√10

z2=3-j

=√10(cos18.435-j*sin18.435)

Arg(z2)=-18.435°

w3=Arg(z1)+Arg(z2)

=153.435°-18.435°

=135°


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Aug 24th 2013, 12:21, by SRXtlink

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標題[PC ] 售 古劍奇壇二 平裝版

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Yahoo!奇摩知識+ - 分類問答 - 生活資訊 - 發問中
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衣服和情侶衣的批發(急!!
Aug 24th 2013, 03:59

知識問題|

發問者: k52****** ( 初學者 5 級)
發問時間: 2013-08-24 11:59:32 ( 還有 9 天發問到期 )
解答贈點: 5 ( 共有 0 人贊助 )
回答: 0 0

哪裡有衣服和情侶衣的批發><?
價錢不要太貴ㄉ!

目前沒有資料

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馬上按讚  加入 Yahoo! 奇摩 知識+  粉絲團

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Yahoo!奇摩知識+ - 分類問答 - 電腦網路 - 投票中
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我已經停不下來買點數!!
Aug 23rd 2013, 02:30

大大 你已經得了 線上遊戲沉迷症狀了~

解決方法:

1. 當機立斷的 跟此遊戲說掰掰  

2. 使用外掛 慢慢的會對遊戲失去玩家的樂趣

3. 減少使用時間 增加其他興趣與娛樂

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參考資料: 打幣行業經驗談

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Aug 24th 2013, 04:43

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Aug 24th 2013, 04:42

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暑假尬童玩 「藝起同玩祭」
Aug 24th 2013, 04:42

【鄭敏玲/台中報導】台灣民俗文物館抓住暑假尾巴,上午舉辦「藝起同玩祭」活動,邀請家長們帶著孩子一起感受古早台灣童玩的樂趣。台灣民俗文物館公關莊喻翔表示,現場除了有多達十多種台灣童玩如打彈珠、套圈圈等讓大家試身手,也有早期童玩特展、在地美食、劇場表演、闖關遊戲等,活動免費,歡迎家長們都能在暑假結束前陪孩子重溫自己的童年。

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現代小朋友沒玩過打彈珠,直呼好有趣。鄭敏玲攝

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自由行 - Yahoo!奇摩 搜尋結果
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暑假尬童玩 「藝起同玩祭」
Aug 24th 2013, 04:42

【鄭敏玲/台中報導】台灣民俗文物館抓住暑假尾巴,上午舉辦「藝起同玩祭」活動,邀請家長們帶著孩子一起感受古早台灣童玩的樂趣。台灣民俗文物館公關莊喻翔表示,現場除了有多達十多種台灣童玩如打彈珠、套圈圈等讓大家試身手,也有早期童玩特展、在地美食、劇場表演、闖關遊戲等,活動免費,歡迎家長們都能在暑假結束前陪孩子重溫自己的童年。

小朋友比賽玩古早童玩,七手八腳相當逗趣。鄭敏玲攝

現代小朋友沒玩過打彈珠,直呼好有趣。鄭敏玲攝

古早柑仔店糖果琳瑯滿目,最受小朋友歡迎。鄭敏玲攝

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