註冊日: 2004-07-28 發表數: 143 University of Texas at Austin
Re: 12345
令原速度=x 10/x-[1/x+9/(x+1)]=45/60 x²+x-12=0 x=-4(不合) or 3 x=3 故歩行10公里需10/3小時
_________________ Atra esternī ono thelduin Mor'ranr līfa unin hjarta onr Un du evarīnya ono varda. May good fortune rule over you Peace live in your heart And the stars watch over you.
2006-08-18 21:21
84927 Home away from home
註冊日: 2006-08-18 發表數: 245 星際外太空
Re: 12345
聽不太懂
_________________
2006-08-22 16:23
gkw0824usa Just can't stay away
註冊日: 2004-07-28 發表數: 143 University of Texas at Austin
_________________ Atra esternī ono thelduin Mor'ranr līfa unin hjarta onr Un du evarīnya ono varda. May good fortune rule over you Peace live in your heart And the stars watch over you.
2006-08-22 18:19
84927 Home away from home
註冊日: 2006-08-18 發表數: 245 星際外太空
Re: 12345
thank :
_________________
2006-08-25 14:14
kurismis117 Just can't stay away
註冊日: 2006-08-22 發表數: 87 楓之島.威多利亞.墮落城市.西門町.7號.2樓
Re: 12345
好難喔!
_________________ E=MC2 人要學數學,數學是永無止盡的!
2006-08-25 14:21
84927 Home away from home
註冊日: 2006-08-18 發表數: 245 星際外太空
Re: 12345
還好吧!
_________________
2006-08-25 14:31
kurismis117 Just can't stay away
註冊日: 2006-08-22 發表數: 87 楓之島.威多利亞.墮落城市.西門町.7號.2樓
Re: 12345
你國中ㄟ!
_________________ E=MC2 人要學數學,數學是永無止盡的!
2006-09-03 09:32
greencat Not too shy to talk
註冊日: 2006-08-08 發表數: 34 台灣
Re: 12345
呵呵~~數學不應該分幾年級喔~~
_________________ 愛， 因為你我而存在。 不需言語的表白， 只需真誠的對待。
2006-09-04 21:56
z81811123 Just popping in
註冊日: 2006-03-16 發表數: 5
Re: 12345
為何第二行會變成x²+x-12=0
_________________ jason
2006-09-06 21:44
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