用换底公式求log(2)25乘log(3)4乘log(5)9的值

详细过程
2024-11-17 11:31:09
推荐回答(4个)
回答1:

log(2)5=log(3)5/log(3)2

log(5)3=log(3)3/log(3)5=1/log(3)5

log(2)25乘log(3)4乘log(5)9

=(2*log(2)5)(2*log(3)2)(2*log(5)3)

=8*log(3)5*log(5)3

=8*log(3)5*1/log(3)5

=8

回答2:

用换底公式
log(2)25乘log(3)4乘log(5)9=lg25/lg2*lg4/lg3*lg9/lg5=8

回答3:

log(2)25*log(3)4*log(5)9
=(ln25/ln2)*(ln4/ln3)*(ln9/ln5)
=2*2*2=8

回答4:

8