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△ABD=(1/3)△ABC
△AFE=(2/3)△ACF=(2/3)×{(1/3)△ACD}=(2/3)×(1/3)×{(2/3)△ABC}=(4/27)△ABC
よって、
∴△ABD:△AFE=(1/3):(4/27)=1:(4/9)=9:4…(答)

瑠歌

理解することが出来ました…!
ありがとうございます🙇‍♀️

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