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發表 lcflcflcf 於 星期二 七月 25, 2006 9:49 pm

由O1CDO2
得∠DO2A=∠CO1B
∠CBO1=∠DAO2
∴BC//AD

[問題]幾何題14

發表 tangpakchiu 於 星期二 七月 25, 2006 8:29 pm

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