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發表 宇智波鼬 於 星期一 十一月 06, 2006 7:52 pm

Ptolemy Theorom...
設CD=x
CD*AB+BC*AD=x+4=BD*AC=根號15*(16-x^2)
x=-4or 7/2 (x>0) so x=7/2

[問題]幾何題40

發表 tangpakchiu 於 星期一 十一月 06, 2006 7:08 pm

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