初二平面几何经典难题，已知ac=bd，求∠b的度数。 , 视频播放量 43771、弹幕量 97、点赞数 549、投硬币枚数 63、收藏人数 473、转发人数 368, 视频作者 毛老师数学课, 作者简介 一起 …

It follows that $$ bd = (k_1a)(k_2c) = (k_1k_2)(ac) $$ Let $k$ be equal to the integer $k_1 k_2$. We see that $(bd) = k(ac)$. Thus, $bd$ is divisible by $ac$.

2013年6月11日 · 分析：首先以CD为边作等边 CDE，连接AE，利用全等三角形的判定得出 BCD≌ ACE，进而求出DE的长即可．. 解答： 提示：此题主要考查了等边三角形的性质以及全等三 …

如图所示，在三角形abc中，ab=ac，点d在ac上且bd=bc=ad,求三角形各角的度数解：解法一：设∠a=x．∵ad=bd，∴∠abd=∠a=x；∵bd=bc，∴∠bcd=∠bdc=2x；∵ab=ac，∴∠abc=∠bcd=2x，∴∠dbc=x；∵x+2x+2x=180°，∴x

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如图，AC，BD相交于点O，且AB=DC，AC=DB．求证：∠ABO=∠DCO．. 证明：连接BC．. ∴ AOB≌ DOC（AAS）．. 连接BC，先证明 ABC≌ DCB，然后证明 AOB≌ DOC，即可证得．. …

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