问题描述：
SAT OG 2道 实在郁闷了～
if a,b,c,fare four nonzero numbers,then all of the following proportions are equivelent EXCEPT
A a/b=b/c
B f/c=b/a
C c/a=f/b
D a/c=b/f
E af/bc=1/1
为什么呢?
if a,b,c,fare four nonzero numbers,then all of the following proportions are equivelent EXCEPT
A a/b=b/c
B f/c=b/a
C c/a=f/b
D a/c=b/f
E af/bc=1/1
为什么呢?
问题解答：
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