CD:AB=GD:(BD+DG)
3:AB=123*0.6:(BD+123*0.6)
即:73.8AB=3BD+221.4 ①
EF:AB=BF:(BD+DB)
3:AB=127*0.6:(BD+1127*0.6)
即:76.2AB=3BD+2028.6 ②
由① ②得
AB=753丈
BD=18450丈
CD:AB=GD:(BD+DG)
3:AB=123*0.6:(BD+123*0.6)
即:73.8AB=3BD+221.4 ①
EF:AB=BF:(BD+DB)
3:AB=127*0.6:(BD+1127*0.6)
即:76.2AB=3BD+2028.6 ②
由① ②得
AB=753丈
BD=18450丈