1.年級：國三
2.科目：數學
3.章節：幾何圖形
4.題目：http://ppt.cc/xWyz
5.想法：試著將菱形的對角線連起,卻無可用線索
也試著利用菱形的平行性質,仍無頭緒
麻煩大家幫忙解題,謝謝!
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