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考察軸截面,則有:底邊長度為9釐米的等腰三角形被平行於底邊的直線截為兩部分;這條直線被等腰三角形的兩腰截得的長度為3釐米,且與底邊之間的距離為4釐米;可得:截得的小等腰三角形和原等腰三角形相似,且相似…
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