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分析:(1)∠COD=∠AOC+∠AOD,求出∠AOD即可,而∠AOD=∠DOE-∠AOE;
(2)根据∠AOF= 1/2(∠DOE-∠AOE)可以求解;
(3)根据角平分线以及垂直的定义,
(1)∵AO⊥BC,DO⊥OE,
∴∠AOC和∠DOE是直角,
∴∠COD=∠AOC+∠AOD=90°+(90°-35°)=145°;
(2)∵OF平分∠AOD,
∠AOF= 1/2(∠DOE-∠AOE)= 1/2(90°-35°)=27.5°.
(3)∵AO⊥BC,DO⊥OE,
∴∠AOC和∠DOE是直角,两角相等;
OF平分∠AOD,则∠AOF=∠DOF;
AO⊥BC,则∠AOB=∠AOC.
1年前
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