EF‖BC,平行线分直线,成比例
AE/AB=AF/AC,
AE²=AD·AB,AD/AE=AE/AB=AF/AC
DF‖EC
已知:如图,EF‖BC,AE²=AD·AB.求证:DF‖EC.
已知:如图,EF‖BC,AE²=AD·AB.求证:DF‖EC.
A
D
E F
B C
A,D,E,B共线,A,F,C共线,连结DF,EF,EC,BC.(大概是这样)
A
D
E F
B C
A,D,E,B共线,A,F,C共线,连结DF,EF,EC,BC.(大概是这样)
数学人气:418 ℃时间:2019-08-20 01:04:51
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