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<p>#1 差不多初二水平的数学题……想得我疯了~~还有我同僚<br /><small>Adapted from Cambrige GCE &quot;A&quot; level Examinations Mathematics Higher 3 syllabus...<br />
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平行四边形ABCD，AC是它的对角线，在AC上截取X, Y两点使AX=CY, DX, DY的延长线分别交AB, BC两边于Z, W, 求证：XY//ZW<br />
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ABCD is a parallelogram. X, Y are points on the diagonal such that AX=CY. The produce of DX and DY cut AB and BC at Z and W respectively. Prove that XY//ZW.<br />
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怕翻译得不好。。特奉上原题~~</small><br />
8/3 20:27<br />
Z_Artemis<br /></p>
<p>#2 回复 #1 Z_Artemis 的帖子<br /><small>..</small><br />
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