Report copyright - 初中几何辅助线秘籍 - dfiles.jiajiaoban.comdfiles.jiajiaoban.com/ohr/2018/04/12/142937_5acefcd1ce19d.pdf · 梯形里面作高线,平移一腰试试看。 平行移动对角线,补成三角形常见。
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