初中数学基本模型有哪些比如一线三等角,共点双线,半角模型等 正方形半角模型是什么?

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\u4f46x2=\uff0d3\u4e0d\u7b26\u5408\u9898\u610f\uff0c\u820d\u53bb\u3002
\u2234x\uff0b1=3
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\u7bee\u7403 130 160
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=\uff0d3x2\uff0b360x\uff0d9600
\uff083\uff09w=\uff0d3x2\uff0b360x\uff0d9600
= \uff0d3\uff08x\uff0d60\uff092\uff0b1125
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1\u3001\u6b63\u65b9\u5f62\u534a\u89d2\u6a21\u578b\u662f\u4ece\u6b63\u65b9\u5f62\u7684\u4e00\u4e2a\u9876\u70b9\u5f15\u51fa\u5939\u89d2\u4e3a45\u00b0\u7684\u4e24\u6761\u5c04\u7ebf\uff0c\u5e76\u8fde\u7ed3\u5b83\u4eec\u4e0e\u8be5\u9876\u70b9\u7684\u4e24\u5bf9\u8fb9\u7684\u4ea4\u70b9\u6784\u6210\u7684\u57fa\u672c\u5e73\u9762\u51e0\u4f55\u6a21\u578b\u3002
2\u3001\u7531\u4e8e\u4e24\u5c04\u7ebf\u7684\u5939\u89d2\u662f\u6b63\u65b9\u5f62\u4e00\u4e2a\u5185\u89d2\u7684\u4e00\u534a\uff0c\u6545\u540d\u534a\u89d2\u6a21\u578b\uff0c\u53c8\u79f0\u201c\u89d2\u542b\u534a\u89d2\u6a21\u578b\u201d\u3002
3\u3001\u5176\u4e2d\uff0c\u5c0645\u00b0\u89d2\u7684\u4e24\u8fb9\u53ca\u5176\u5bf9\u8fb9\u56f4\u6210\u7684\u4e09\u89d2\u5f62\u79f0\u4e3a\u201c\u534a\u89d2\u4e09\u89d2\u5f62\u201d\uff08\u5373\u56fe\u4e2d\u7684\u25b3AEF\uff09
\u4e8c\u3001\u534a\u89d2\u6a21\u578b\u7684\u7ed3\u8bba\uff1a
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一线三等角,三垂直,八字,蝴蝶,A字,燕尾,线束....还有好多好多。反正记住一些基本的考点就可以了。举个例子,看到了中点,就五个考点,倍长中线,斜边中线,三线合一,中位线,重心定理的1:2

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