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✨ Best Answer ✨

NDの長さを1とすると
NC=1, DC=AB=2

△BME≡△CMDだからBE=CD
よって(DC=)EB=2

よってAE=AB+EB=2+2=4

△AFE∽△NFDだから
AE:ND=AF:NF=4:1

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