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正因為搞不清楚是什麼角為30°,這個題目才有思考價值! ∠B可以是頂角,也可以是底角. (1)當30°為頂角時,兩底角都是75°,則有.∠B=75° (2)當30°為底角時,另一底角也是30°,頂角是120° 所以∠B=30°,或者∠B=120°
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