已知长方形ABCD,S△ACE=20,S△EOF=7,S△BDF=13,求阴影部分面积?
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分享交流一下我的解题思路:
设S△CEO=a S△
COD=b
S△CED=S△CFD
S△CEO=S△DFO=a
S△CED=½×S▱ABCD=a+b
a+b=a+20+7+13
b=40
S阴=40
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