7.求證:一個三角形中,至少有一個內(nèi)角不小于
,用反證法證明時的假設為“三角形的 ”.
答案:三個內(nèi)角都小于![]()
6.使不等式
成立的條件是(
)
A.
B.![]()
C.
,且
D.
,且![]()
答案:D
5.以下數(shù)列不是等
差數(shù)列的是( )
A.
B.![]()
C.
D.![]()
![]()
答案:C
4.求證:
.
證明:要證
,只需證
,即證
,
,
,
原不等式成立.
以上證明應用了( )
A.分
析法
B.綜合法 C.分析法與綜合法配合使用 D.間接證法
答案:A
3.若
是不全相等的實數(shù),求證:
.
證明過程如下:
,
,
,
,
又
不全相等,
以上三式至少有一個“
”不成立,
將以上三式相加得
,
.此證法是(
)![]()
A.分析法 B.綜合法
C.分析法與綜合法并用 D.反證法
答案:B
2.用反證法證明一個命題時,下列說法正確的是( )
A.將結論與條件同時否定,推出矛盾
B.肯定條件,否定結論,推出矛盾
C.將被否定的結論當條件,經(jīng)過推理得出的結論只與原題條件矛盾,才是反證法的正確運用
D.將被否定的結論當條件,原題的條件不能當條件
答案:B
1.下列說法不正確的是( )
A.綜合法是由因導果的順推證法
B.分析法是執(zhí)果索因的逆推證法
C.綜合法與分析法都是直接證法
D.綜合法與分析法在同一題的證明中不可能同時采用
答案:D
某英文雜志就“建立和諧家園、和諧社會”為主題征文。請以“My family and I”為題,為該報寫一篇征文。征文應包括以下要求:
①.家庭成員及其基本情況。
②.家庭成員對你的關心、幫助、理解。(舉例說明)
③.家庭對你的重要性。
注意:1.詞數(shù):100詞左右。2.文章中不能出現(xiàn)學校名稱、姓名等個人信息。
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新建二中2010-2011學年度第一學期第一次月考答題紙
高三英語
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新建二中2010-2011學年度上學期高三英語第一次月考
A.I’ve got two t 76 for the rock concert tomorrow evening. Would you like to go with me?
B. Sorry, I don’t like r 77 music very much.
A. What k 78 of music do you like?
B. Pop music especially country music.
A. Why do you like l 79 to the country music?
B. Well, the country singers often play the guitar while s 80 the songs. And I like playing the guitar.
A. What’s country music about?
B. It’s about c 81 things for everyone.
A. How a 82 rock music?
B. It expresses true f 83 about society、friend and even war.
A. What’s the greatest d 84 between pop music and rock music?
B. Most pop singers take music as their career, w 85 rock singers make music their life.
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