>
数学
>
函数y=
1−lnx
1+lnx
的导数是( )
A. -
2
(1+lnx)
2
B.
2
x
(1+lnx)
2
C. -
2
x
(1+lnx)
2
D. -
1
x
(1+lnx)
2
人气:211 ℃ 时间:2019-08-17 02:02:11
解答
由y=
1−lnx
1+lnx
,
所以
y
′
=(
1−lnx
1+lnx
)
′
=
(1−lnx
)
′
(1+lnx)−(1−lnx)(1+lnx
)
′
(1+lnx
)
2
=
−
2
x(1+lnx
)
2
.
故选C.
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