搜题请搜索小程序“爱下问搜题”
问题 填空题
函数f(x)=2
1+x
x
的值域为______．
答案

令t=

1+x
x
=1+
1
x

则t≠1

故y=2

1+x
x
=2t，（t≠1）

则y＞0，且y≠2

故函数f(x)=2

1+x
x
的值域为：（0，2）∪（2，+∞）

故答案为：（0，2）∪（2，+∞）

完形填空

US first lady Michelle Obama ranked the world’s most powerful woman in Forbes magazine’s 2010 listing published on October 6.

Kraft Foods CEO Irene Rosenfeld小题1:.second . American talk show host Oprah Winfrey was third. German Prime Minister Angela Merkel was the fourth most powerful   woman，小题2:US Secretary of State Hillary Clinton rounded out (使圆满) the top five.

This year Forbes小题3:the way it ranked  women. It is now supposedly小题4:less on wealth and power but more on influence.

“小题5:They influenced ， sometimes billions of people，” said Moira Forbes， vice  president and publisher of Forbes Woman.

Forbes said Obama topped the list this year小题6:        “she has made the office of first lady her own” while remaining popular.

“She’s also effective： In response to her Let’s Move！campaign小题7:childhood obesity(肥胖)， companies 小题8:       Coca-Cola， Kellogg and General Mills have agreed to cut the calorie content of their foods by 2015，” Forbes said.

查看答案
单项选择题

信息通常被认为是一种已被加工或处理成特定形式的( )。

A．数字

B．数据

C．图像

D．文字
查看答案