9.如图7-59所示,在三角形ABC中,∠ A =60°.∠1=60°,2=120°,试说明:(1)DE∥AC;(2) AB∥EF .A D201B EC图7-59 相关知识点: 试题来源: 解析 9.解:(1/A 60/#66.A =1.DE∥AC 同 位角相等,两直线平行).(2)A .2=120°.A 22-180°..AB /EF(同旁内角互补,两直线平行)...
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分析:易证EF∥AD,然后根据两直线平行,同位角相等即可证得∠1=∠BAD,则∠BAD=∠2,根据内错角相等,两直线平行即可证得. 解答:证明:∵AD⊥BC,EF⊥BC, ∴∠EFB=∠ADB=90°, ∴EF∥AD, ∴∠1=∠BAD, 又∵∠1=∠2, ∴∠BAD=∠2, ∴DG∥AB. ...
ef\uff1a\u54ea\u53ef\uff0c\u600e\u4e48\u80fd\u591f\u3002\u2461\u8d4a\uff1a\u8d4a\u6b20\u3002" "questionList":{"1":{"title":"\u8ff7\u4eba\u7684\u6708\u8272\uff0c\u7528\u4e4b\u4e0d\u7aed\uff0c\u53d6\u4e4b\u65e0\u7981\uff0c\u76f8\u4fe1\u4f60\u4e5f\u4eab...
u88ab\u6392\u6324\u51fa\u671d\u5ef7\u7684\u6fc0\u6124\u548c\u6291\u90c1\u4e4b\u60c5\uff0e\uff081\u5206\uff0c\u610f\u5bf9\u5373\u53ef\uff09" "choose":"" "type":0} "2":{"title":"\u7b80\u6790\u201c\u5927\u6f20\u5b64\u70df\u76f4\uff0c\u957f\u6cb3\u84...
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