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△ABC∽△AEGから、
AE:AB=EG:BC
→ 9:15=EG:18
→ EG=54/5

△BEF∽△BADから
BE:BA=EF:AD
→ 6:15=EF:12
→ EF=24/5

FG=54/5-24/5
 =6

意味が分かりました!!ありがとうございます(_ _)

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