註冊日: 2004-07-28 發表數: 143 University of Texas at Austin
滿難的幾何證明
已知AD:DC=AZ:ZH 求證KJ平行AC
_________________ 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.
2005-01-24 18:15
luliying800102 Just popping in
註冊日: 2004-05-06 發表數: 7 喵咪共和國
Re: 滿難的幾何證明
說不定可以用反證法 也就是將題目改成: 如果KJ平行AC AD:CD=AZ:HZ
_________________ Lu Li Ying
2005-01-28 18:00
訪客
Re: 滿難的幾何證明
不好意思,因我不會貼圖 所以我用口頭敘述的 將AE ZE HE延長 然後做兩條直線經D C平行AE 使其與ZE HE交於D` C` 而直線D`C`交AE於A` KE:D`K=BE:D`D and EJ:JC`=BE:C`C 又D`D=C`C 所以KE:D`K=EJ:JC` 所以JK//D`C//AC
2005-01-29 16:21
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.
2005-01-30 11:20
JG25208 Home away from home
註冊日: 2004-03-28 發表數: 165 油中
Re: 滿難的幾何證明
其實用梅涅勞斯(Menelaus)定理還滿麻煩的
2005-02-06 21:03
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