选修4-5:不等式选讲 设函数f(x)=|2x-4|+|x+2| (Ⅰ)求函数y

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问题:

选修4-5:不等式选讲

设函数f(x)=|2x-4|+|x+2|

(Ⅰ)求函数y=f(x)的最小值;

(Ⅱ)若不等式f(x)≥|a+4|-|a-3|恒成立,求a的取值范围.

考点:绝对值不等式
题型:选择题

原发性闭角型青光眼和原发性开角型青光眼的根本区别是()

A.眼压升高的快慢

B.眼压升高的程度

C.眼压升高时房角是开放还是闭合

D.眼压控制时房角是开放还是闭合

E.视功能损伤的程度

题型:选择题

产品要求不是由______规定的。

A.顾客

B.组织

C.法规

D.质量管理体系

题型:选择题

Have you ever thought about what you would like to do after school? Perhaps one of these rather different jobs will suit you.

TASTER: Food companies need people to taste the products that they are making. So many kinds of no bad-tasting food are put onto the supermarket shelves. All tasters do all day is take small bites of food. They make notes of what tastes good and what tastes bad. It is not a job for those who would like to stay thin.

SNAKE MILKER: This involves taking the poison out of a snake’s teeth. You hold the snake over a glass and make it open its mouth very wide. The poison will then drip from the back of the teeth into the glass; this is known as milking the snake. You have to be very brave if you want to try this.

GOLF BALL HUNTER: You will spend your day diving into waterholes at different golf courses to hunt for lost golf balls. You could be picking up as many as 5,000 balls a day. Many golfers are willing to buy used golf balls and you could be making a lot of money.

CLOCK CLEANER: Every day you will be climbing to the top of the clock towers in the city. Your responsibilities will be to oil, wind and repair the clocks. This is not a job for someone who is afraid of heights.

小题1: If you are a taster, you will          .

A.pick up golf balls

B.oil and repair the clocks

C.get some milk from snakes

D.try different kinds of food小题2: If you are afraid of heights, you’d better not choose the job as a          .

A.taster

B.snake milker

C.clock cleaner

D.golf ball hunter小题3: You can probably find this passage in a          .

A.newspaper

B.textbook

C.report

D.novel

题型:选择题

如果农历正月初一为甲子,则三月初二为( )。

A.甲子
B.乙丑
C.丙寅
D.丁卯

题型:选择题

进食后,血糖的主要去路是()

A.转变成脂肪

B.转变成氨基酸

C.合成肌糖原

D.转变为非糖物质

E.合成肝糖原

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