已知长方形ABCD,S△CEF=16cm²,S△BDF=9cm²,求长方形面积?
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分享交流一下我的解题思路:
S△ABC=S△ABF
S△AEC=S△BEF=a
S△ABC=S△CDB
a+b=a+9+16
b=25
a/b=16/a
a²=16×b=16×25=400
a=20
S长方形=(25+20)×2=90
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