✔ 最佳答案
126a=3
log126a=log3
alog126=log3
a=log3/log126
=log1263
126b=7
log126b=log7
blog126=log7
b=log7/log126
=log1267
(1+a-b)/(1-a)
=(1+ log1263- log1267)/(1- log1263)
=(log126126+ log1263- log1267)/( log126126- log1263)
=log126[(126x3)/7] / log126(126/3)
=log12654/log12642
=log54/log42
42【(1+a-b)/(1-a)】
=42( log54/log42)
=54
2009-07-18 20:26:12 補充:
對數