已知梯形ABCD,E、F分别是AC、CD中点,S△ABE=3cm²,S△BDF=8cm²,求S阴=?
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分享交流一下我的解题思路:
连接BC
E、F分别是AC、CD中点
S△BCE=S△ABE=3
S△BCF=S△BDF=8
S△CEF=½×S△BDF=4
S阴=S△BCE+S△BCF-S△CEF
=3+8-4=7cm²
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