若{an}为等比数列,且a1a100=64,则log以2为底a1+log以2为底a2+...+log以2为底a100等于多少

2024-12-29 01:09:29
推荐回答(2个)
回答1:

a1a100=64
a2a99=64
a3a98=64
....
a49a52=64
a50a51=64

log以2为底a1+log以2为底a2+...+log以2为底a100
=log以2为底a1+log以2为底a100+log以2为底a2+log以2为底a99+...+log以2为底a50+log以2为底a51
=log以2为底(a1*a100)+log以2为底(a2*a99)+...+log以2为底(a50*a51)
=log以2为底(64)+log以2为底(64)+...+log以2为底(64)
=log以2为底(2^6)+log以2为底(2^6)+...+log以2为底(2^6)
=6+6+6+...+6
=6*50
=3000

回答2:

300