B(B,-1/B),D(-B, 1/B)
BD的斜率是-1/B²,xy=1過A點的切線也是-1/B²(因為平行於BD)
所以A=B , 同理C=B
A=B=C=D
B(B,-1/B),D(-B, 1/B)
BD的斜率是-1/B²,xy=1過A點的切線也是-1/B²(因為平行於BD)
所以A=B , 同理C=B
A=B=C=D
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問題在同理上,B,D切線平行,A,C切線平行,隻有B=D,A=C,
-jinjing-
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(33 bytes)
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07/03/2011 postreply
08:38:39
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你糊塗了吧?
-15少-
♂
(89 bytes)
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07/03/2011 postreply
08:59:03
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可能有誤解,我拿了筆,是不大糊塗大的.
-jinjing-
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07/03/2011 postreply
10:04:32
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後麵用什麽都行
-說了就走-
♂
(358 bytes)
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07/03/2011 postreply
20:40:08
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對不起,您的"然後就要具體計算切線了,很簡單但是沒什麽意思了。"
-jinjing-
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(31 bytes)
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07/04/2011 postreply
06:58:50
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