>
数学
>
若函数f(x)=
ax+1
x+2
(a为常数),在(-2,2)内为增函数,则实数a的取值范围( )
A.
(−∞,
1
2
)
B.
[
1
2
,+∞)
C.
(
1
2
,+∞)
D.
(−∞,
1
2
]
人气:439 ℃ 时间:2019-08-20 21:15:11
解答
∵f(x)=
ax+1
x+2
(a为常数),
而
ax+1
x+2
=
a(x+2)−2a+1
x+2
=a+
−2a+1
x+2
∵f(x)在(-2,2)内为增函数
而x+2为增函数,
1
x+2
为减函数
∴要使f(x)在(-2,2)内为增函数
∴-2a+1<0
解得:a>
1
2
故答案为:C
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