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时间:2018-04-08
《【中考数学必备专题】中考模型解题系列之大角夹半角模型》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、【中考数学必备专题】中考模型解题系列之大角夹半角模型一、解答题(共1道,每道100分)1.(2010重庆改编)等边的两边AB、AC所在直线上分别有两点M、N,D为外一点,且,,BD=DC.探究:当M、N分别在直线AB、AC上移动时,BM、NC、MN之间的数量关系及的周长Q与等边的周长L的关系. (I)如图1,当点M、N在边AB、AC上,且DM=DN时,BM、NC、MN之间的数量关系是_____________;此时___________; (II)如图2,点M、N在边AB、AC上,且当DMDN时,猜想(I)
2、问的两个结论还成立吗?写出你的猜想并加以证明; (III)如图3,当M、N分别在边AB、CA的延长线上时,若AN=,则Q=_________(用、L表示). 第3页共3页 内部资料,请勿外传!9JWKffwvG#tYM*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#&QA9wkxFyeQ^!djs#XuyUP2kNXpRWXmA&UE9aQ@Gn8xp$R#͑Gx^Gjqv^$UE9wEwZ#Qc@UE%&qYp@Eh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ks
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