已知f(x)=lg,A=f(x+1),B=f(x)+f(1)，比较A、B的大小.

答案

思路分析：比较大小通过作差与0比较.

解：A=f(x+1)

=lg,

B=lg.

∵=(10^x-10^-x)，

∴当x=0时，A=B；当x＞0时，A＞B;当x＜0时，A＜B.

相关题目

2009年“家电下乡”政策实施，由中央和地方财政以直补方式

2009年“家电下乡”政策实施，由中央和地方财政以直补方式对农民购买试点产品给予销售价格13%的补贴，家电产品的价格降低，市场上消费者对家电的

Every student and every teacher ________. A.are going to attend the meeting �

Every student and every teacher ________. A.are going to attend the meeting B.have attended the meeting C.has attended the meeting

在“用电流表、电压表小灯泡测电阻”的实验中，滑动变阻

在“用电流表、电压表小灯泡测电阻”的实验中，滑动变阻器不能起到的作用是A．改变电路中的电流B．改变被测电阻的阻值C．改变被测电阻两端的电

建设资源型和环境友好型社会，必须强化全民族的环保意识

建设资源型和环境友好型社会，必须强化全民族的环保意识和节约意识。这是因为 (1)实践是有意识、有目的的活动 (2)主观能动性决定事物发展的方向 (3

_____，there were also no lights in the houses along the street． A

_____，there were also no lights in the houses along the street． A．There not only were no streetlights B．Not only there were no streetlights C．Not onl

金属A、B跟质量相同、质量分数相同的稀硫酸反应，生成氢气

金属A、B跟质量相同、质量分数相同的稀硫酸反应，生成氢气的质量与反应时间有右图所示关系（已知：A、B在生成物中均为+2价）。则下列结论中，不

下列说法正确的是

下列说法正确的是 ( )A、难溶于水的电解质一定是弱电解质B、易溶于水

Parents whose children show a special interest in a sport feel very difficult to

Parents whose children show a special interest in a sport feel very difficult to make a decision about their children’s careers．Should they allow their children to train to become top sportsmen an

已知f(x)=lg,A=f(x+1),B=f(x)+f(1)，比较A、B的大小.

答案

相关题目

最新题目