已知函数f(x)=x3-x2,x∈R. (Ⅰ)若正数m、n满足m•n>1,证明:

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问题:

已知函数f(x)=x3-x2,x∈R.

(Ⅰ)若正数m、n满足m•n>1,证明:f(m)、f(n)至少有一个不小于零;

(Ⅱ)若a、b为不相等的正数,且满足f(a)=f(b),求证:a+b>1.

考点:反证法与放缩法
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女性,30岁,半年前感冒后咳嗽并伴气喘,经治疗好转,此后稍受凉或嗅到特殊气味、灰尘均有气喘发作,1日来受凉喘又发作,较剧,咳嗽,痰不多,收住院治疗

经治疗患者好转,为巩固治疗和预防复发,最好的方法是()

A.口服阿托品 

B.长期口服氨茶碱 

C.长期服用抗生素 

D.口服色甘酸二钠 

E.必可酮或必可松雾化吸入

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— There was a lot of fun at yesterday's party. You ________ come. Why didn't you?

— What a pity! But I had no time because I had lots of homework to do. [      ]

A. must have  

B. should

C. need have  

D. ought to have

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扑救地下建筑火灾的基本方法有()。

A.深入地下近战

B.地面喷射灭火

C.封闭窒息火焰

D.采取注水措施

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假设你是Mr Hunter , 某英语报社的主编。下面是Jimmy 写给你的一封信,请仔细阅读这封信,并就他所提的问题给写封回信。

Dear Sir ,

I’m a Senior 3 student this year . Facing the College Entrance Examination , I feel a lot of pressure . But unfortunately , my mother cannot understand me . Every time I turn on the TV set  , she will switch it off . Therefore ,we often quarrel about whether I can watch TV after school . You know , through my window , I can see so vivid pictures from across the window of my good friend’s house , which is opposite ours. How exciting the football match always is ! Even worse , my mobile phone was taken back yesterday just because of my failure in my maths for the first time . Also , recently I am often wanted by my teacher to his office .In all , I feel stressed out .I don’t know what I can do . Please help me .

Looking forward to your reply .

Yours ,

Jimmy

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根据《票据法》的规定,下列关于本票的表述,不正确的是( )。

A.到期日是本票的绝对应记载事项

B.本票的基本当事人只有出票人和收款人

C.本票无须承兑

D.本票是由出票人本人对持票人付款的票据

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