面積計算(上篇) (五年級) ~ 清大附小 馮汝琪老師(有cc字幕、影片重點整理)
Synopsis
平行的概念是支撐在平行四邊形、三角形及梯形這些圖形中，「高」是如何存在的重要概念，因此本單元的教學就從「平行」開始 ...
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