已知:梯形DCEF,A、B是DE、EF中点,S△ACD=3,S△CBF=8,求S阴=?
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分享交流一下我的解题思路:
A、B是DE、EF中点
S△ACE=S△ACD=3
S△BCE=S△BCF=8
S△ABE=½×S△CBF=4
S阴=3+8-4=7
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