Mathematics
Senior High
解き方がわかる人は教えてください！
ABCD において, 辺CD の中点をE とし, Aか底面 CD に垂線 AH を下
上EH が成り立つことを, ベクトルなを用いて証明せよ。
_48 <Y 4でまで が= いゃ<
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