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[問題] 溶度積常數與溶解度的問題

[ SENIORHIGH ]1 留言, 推噓總分: +1

作者: tsaip - 發表於 2012/03/25 23:44(13年前)

1^F推herculus6502:S/2吧03/26 11:33

Re: [問題]一題數學求解

[ SENIORHIGH ]12 留言, 推噓總分: +2

作者: tsengandy - 發表於 2012/02/02 11:08(14年前)

1^F推herculus6502:先聲明，這種題目指考/學測應該不考了(吧)02/02 11:35

2^F→herculus6502:兩邊通分為sin 2x*sin 3x=sin x*sin 3x+sin x*sin 2x02/02 11:36

3^F→herculus6502:積化和差為cos x-cos 5x=cos 2x-cos 4x+cos x-cos 3x02/02 11:38

4^F→herculus6502:移項得cos 5x-cos 3x=cos 4x-cos 2x02/02 11:39

5^F→herculus6502:和差化積得six 4x*sin x=six 3x*sin x02/02 11:40

6^F→herculus6502:由題目知sin x不可為0，故sin 4x-sin 3x=002/02 11:41

7^F→herculus6502:和差化積得cos (7*x/2) * sin (x/2)=002/02 11:43

8^F→herculus6502:由題目知sin (x/2)不可為0，故cos (7*x/2)=002/02 11:44

9^F→herculus6502:故7*x/2=+-pi/2 or +-pi*3/2 or +-pi*5/202/02 11:46

[問題]一題數學求解

[ SENIORHIGH ]15 留言, 推噓總分: +4

作者: tsengandy - 發表於 2012/02/01 17:56(14年前)

5^F推herculus6502:用積化和差/和差化積解好像比較快，pi/7 & 3*pi/702/01 21:37

6^F推herculus6502:更正，+-pi/7 , +-3*pi/702/01 21:42

11^F推herculus6502:對，我少寫+-5*pi/702/02 06:53

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