>
数学
>
已知:3
m
=4,
3
m−4n
=
4
81
,则1999
n
的值为______.
人气:205 ℃ 时间:2019-11-02 15:02:50
解答
∵3
m-4n
=
4
81
,
∴3
m
÷3
4n
=
4
81
,
∴3
m
=
4
81
×3
4n
,
又∵3
m
=4,
∴4=
4
81
×3
4n
,
∴81=3
4n
=81
n
,
∴n=1,
∴1999
n
=1999
1
=1999.
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