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發表 lcflcflcf 於 星期三 七月 26, 2006 8:02 pm

延長BO1交☉O1於E
∠CBO1=90-∠CEO1
=90-∠BAD
=90-∠BO2D/2
=∠O2BD

[問題]幾何題20

發表 tangpakchiu 於 星期三 七月 26, 2006 7:36 pm

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