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BE:EC=4:3なので
△ABC:AEC=7:3
(1)よりAF:FE=7:6なので
△AEC:△FEC=13:6
よって△FEC=3/7×6/13×△ABC
=18/91×△ABC
したがって
△FEC:△ABC=18:91
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ありがとうございます！おかげでわかりました🙏