初一数学平行线证明题,可加辅助线,求!!
如题所述
第1个回答 2015-03-12
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/f3d3572c11dfa9ec2f9de37866d0f703918fc12a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追问不太清楚
能拍清楚一下吗
追答![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/8cb1cb1349540923c505d3119658d109b3de4974?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
第2个回答 2015-03-12
那条ab ef
追问写一下完整过程谢谢
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/060828381f30e924191fdf5e48086e061d95f722?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
第3个回答 2015-03-12
上面那个角等于下面那个角
追问写一下完整过程
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/9358d109b3de9c82fba6b5e06881800a18d84399?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追答角1等于角2,好像有个定理说明平行的
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初一下册平行线的证明题~答:23、已知,如图16,AB‖CD,GH是相交于直线AB、EF的直线,且∠1+∠2=1800.试说明:CD‖EF.24、如图18,已知AB‖CD,∠A=600,∠ECD=1200.求∠ECA的度数.五、探索题(第27、28题各4分,本大题共8分)25、如图19,已知AB‖DE,∠ABC=800,∠CDE=1400.请你探索出一种(只须一种)添加辅助线...