AB:BD=3:18AB+BD=28Maka,pBD/pAB+pBD×28=BD18/3+18×28=18/21×28=18/3×4=6×4=24
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AB:BD=3:18
AB+BD=28
Maka,pBD/pAB+pBD×28=BD
18/3+18×28=18/21×28=18/3×4=
6×4=24