如图,在△ABC中,点O为AC边上一个动点,过点O作直线MN∥BC,设MN交∠BCA的平分线于点E,交∠ACD的平分线于点F.求证:①OE=OF.②点O运动到何处时,四边形AECF为矩形.证明你的结论.③△ABC满足什么条件,
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/17 02:08:31
![如图,在△ABC中,点O为AC边上一个动点,过点O作直线MN∥BC,设MN交∠BCA的平分线于点E,交∠ACD的平分线于点F.求证:①OE=OF.②点O运动到何处时,四边形AECF为矩形.证明你的结论.③△ABC满足什么条件,](/uploads/image/z/12578816-56-6.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E7%82%B9O%E4%B8%BAAC%E8%BE%B9%E4%B8%8A%E4%B8%80%E4%B8%AA%E5%8A%A8%E7%82%B9%2C%E8%BF%87%E7%82%B9O%E4%BD%9C%E7%9B%B4%E7%BA%BFMN%E2%88%A5BC%2C%E8%AE%BEMN%E4%BA%A4%E2%88%A0BCA%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%E4%BA%8E%E7%82%B9E%2C%E4%BA%A4%E2%88%A0ACD%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%E4%BA%8E%E7%82%B9F.%E6%B1%82%E8%AF%81%EF%BC%9A%E2%91%A0OE%3DOF.%E2%91%A1%E7%82%B9O%E8%BF%90%E5%8A%A8%E5%88%B0%E4%BD%95%E5%A4%84%E6%97%B6%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2AECF%E4%B8%BA%E7%9F%A9%E5%BD%A2.%E8%AF%81%E6%98%8E%E4%BD%A0%E7%9A%84%E7%BB%93%E8%AE%BA.%E2%91%A2%E2%96%B3ABC%E6%BB%A1%E8%B6%B3%E4%BB%80%E4%B9%88%E6%9D%A1%E4%BB%B6%2C)
xV[oG+Q!mDIޒmqJ}Z.lo8\gf!gvH`!R+Ujlvg;s7( فhlSiW
4yNuQ1-(cUpݠ#v_;`$o;
jmp-ă A0Z(z5˛4(y{Q-bC@)Dfw'Ϳ#?TN.(\Pg,(
4̹+X.S/<=i*J?N58]:<<