不等式的
证明
住所证明下载场所使用证明下载诊断证明下载住所证明下载爱问住所证明下载爱问
(放缩法)
1.设
,
,则
的大小关系是( )
A.
B.
C.
D.
2.已知三角形的三边长分别为
,设
,则
与
的大小关系是 ( )
A.
B.
C.
D.
3.设不等的两个正数
满足
,则
的取值范围是 ( )
A.
B.
C.
D.
4.设
,则
与1的大小关系是 .
5.设
,则
的整数部分为 .
6.已知
均为正数,且
,求证:
.
7.设
,求证:
.
8.设
,求证:
.
9.设
,求证:
.
10.设
,求证:不等式
对所有的正整数
都成立.
简答:
1.B 提示:
2.D 提示:由
,得
,
3.B 提示:由条件得
,所以
,故
.又
,可得
,从而
,所以
,故
.
4.A<1
5.18 提示:因为
时,
,所以
,即
故
所以所求整数部分为18.
6.解:由已知可知,
,所以
,
所以原不等式得证.
7.提示:由
,累加即得.
8.提示:
.
9.提示:
,累加即得.
10.提示:
_1240209045.unknown
_1240209756.unknown
_1240211162.unknown
_1240211425.unknown
_1240211551.unknown
_1240211632.unknown
_1240211707.unknown
_1240211755.unknown
_1240211837.unknown
_1240211650.unknown
_1240211571.unknown
_1240211481.unknown
_1240211525.unknown
_1240211444.unknown
_1240211339.unknown
_1240211384.unknown
_1240211188.unknown
_1240209910.unknown
_1240210359.unknown
_1240211059.unknown
_1240211142.unknown
_1240210766.unknown
_1240210830.unknown
_1240210960.unknown
_1240210508.unknown
_1240210189.unknown
_1240210286.unknown
_1240209967.unknown
_1240209795.unknown
_1240209847.unknown
_1240209784.unknown
_1240209354.unknown
_1240209557.unknown
_1240209671.unknown
_1240209708.unknown
_1240209600.unknown
_1240209509.unknown
_1240209529.unknown
_1240209454.unknown
_1240209216.unknown
_1240209260.unknown
_1240209280.unknown
_1240209240.unknown
_1240209134.unknown
_1240209198.unknown
_1240209097.unknown
_1240208711.unknown
_1240208872.unknown
_1240208905.unknown
_1240208921.unknown
_1240208886.unknown
_1240208819.unknown
_1240208834.unknown
_1240208725.unknown
_1240208607.unknown
_1240208659.unknown
_1240208667.unknown
_1240208622.unknown
_1240208455.unknown
_1240208505.unknown
_1240208438.unknown