新高考数学一轮复习百题刷过关专题08 基本不等式综合必刷100题(2份打包,原卷版+解析版)
展开一、单选题
1.已知 SKIPIF 1 < 0 均为正实数,且满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
2.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
3.已知圆C1:x2+y2+4ax+4a2-4=0和圆C2:x2+y2-2by+b2-1=0只有一条公切线,若a,b∈R且ab≠0,则 SKIPIF 1 < 0 + SKIPIF 1 < 0 的最小值为( )
A.3B.8C.4D.9
4.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A.9B.10C.11D. SKIPIF 1 < 0
5.已知 SKIPIF 1 < 0 ,函数 SKIPIF 1 < 0 在 SKIPIF 1 < 0 处的切线与直线 SKIPIF 1 < 0 平行,则 SKIPIF 1 < 0 的最小值是( )
A.2B.3C.4D.5
6.已知直线 SKIPIF 1 < 0 与圆 SKIPIF 1 < 0 相切,则 SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
7.若 SKIPIF 1 < 0 , SKIPIF 1 < 0 且 SKIPIF 1 < 0 ,则下列结论中正确的是( )
A. SKIPIF 1 < 0 的最大值是 SKIPIF 1 < 0 B. SKIPIF 1 < 0 的最小值是 SKIPIF 1 < 0
C. SKIPIF 1 < 0 的最小值是 SKIPIF 1 < 0 D. SKIPIF 1 < 0 的最小值是 SKIPIF 1 < 0
8.已知a,b为正实数,且满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A.2B. SKIPIF 1 < 0 C.4D. SKIPIF 1 < 0
9.已知在 SKIPIF 1 < 0 中,动点C满足 SKIPIF 1 < 0 ,其中 SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
10.若实数 SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的取值范围是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
11.已知正数x,y满足x2+2xy-3=0,则2x+y的最小值是( )
A.1B.3
C.6D.12
12.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A.1B.2C.3D.4
13.若 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
14.若正数 SKIPIF 1 < 0 , SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
15. SKIPIF 1 < 0 的内角A,B,C的对边分别为a,b,c,若 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 面积的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C.1D.2
16.设a,b为正数,若圆 SKIPIF 1 < 0 关于直线 SKIPIF 1 < 0 对称,则 SKIPIF 1 < 0 的最小值为( )
A.9B.8C.6D.10
17.已知 SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
18.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,若 SKIPIF 1 < 0 恒成立,则实数 SKIPIF 1 < 0 的最小值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
19.已知 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A.1B.4C.7D. SKIPIF 1 < 0
20.已知正数a,b满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值等于( )
A.4B. SKIPIF 1 < 0 C.8D.9
21.下列函数中最小值为4的是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0
C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
22.若直线 SKIPIF 1 < 0 ( SKIPIF 1 < 0 , SKIPIF 1 < 0 )被圆 SKIPIF 1 < 0 截得弦长为 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
23.设 SKIPIF 1 < 0 为正数,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
24.已知正实数 SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
25.在等比数列 SKIPIF 1 < 0 中, SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
26.已知实数a,b,c成等差数列,则点 SKIPIF 1 < 0 到直线 SKIPIF 1 < 0 的最大距离是( )
A. SKIPIF 1 < 0 B.1C. SKIPIF 1 < 0 D.2
27.实数a,b满足 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A.4B.6C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
28.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
29.设 SKIPIF 1 < 0 (其中0
A.有最大值 SKIPIF 1 < 0 B.有最小值 SKIPIF 1 < 0 C.有最大值 SKIPIF 1 < 0 D.有最小值 SKIPIF 1 < 0
31.已知 SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A.4B.6C.9D.12
32.设 SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A.1B.2C.3D.4
33.设 SKIPIF 1 < 0 均为正实数,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A.8B.16C.9D.6
34.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,若不等式 SKIPIF 1 < 0 恒成立,则实数 SKIPIF 1 < 0 的取值范围是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
35.已知实数 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
36.设 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A.1B.2C.3D.4
37.若x,y∈R+,3x+y—xy=0,则2x+y的最小值为( )
A.2 SKIPIF 1 < 0 +5B.4 SKIPIF 1 < 0 C.12D.6
38.若正数x,y满足x2+6xy-1=0,则x+2y的最小值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
39.若 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A.8B.10C.4D.6
40.已知实数m,n满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
任务二:中立模式(中档)1-40题
1.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 且 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 的大小关系是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0
C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
2.已知实数 SKIPIF 1 < 0 , SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0
C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
3.在 SKIPIF 1 < 0 中,内角 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 的对边分别为 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 ,若 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 边上的中线 SKIPIF 1 < 0 长的取值范围是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
4.已知实数 SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
5.如图,在 SKIPIF 1 < 0 中,C是 SKIPIF 1 < 0 的中点,P在线段 SKIPIF 1 < 0 上,且 SKIPIF 1 < 0 .过点P的直线交线段 SKIPIF 1 < 0 分别于点N,M,且 SKIPIF 1 < 0 ,其中 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C.1D. SKIPIF 1 < 0
6.已知 SKIPIF 1 < 0 ,满足 SKIPIF 1 < 0 则 SKIPIF 1 < 0 的最小值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
7.已知实数 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A.1B.27C.8D.9
8.若 SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
9.若 SKIPIF 1 < 0 , SKIPIF 1 < 0 且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A.3B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
10.设 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C.4D. SKIPIF 1 < 0
11.如图,在平行四边形 SKIPIF 1 < 0 中,点 SKIPIF 1 < 0 是 SKIPIF 1 < 0 的中点,点 SKIPIF 1 < 0 为线段 SKIPIF 1 < 0 上的一动点,若 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C.1D.2
12.若实数 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,不等式 SKIPIF 1 < 0 恒成立,则正实数 SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
13. SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B.13C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
14.若a,b,c均为正实数,则 SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
15.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
16.若正实数 SKIPIF 1 < 0 , SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A.7B.6C.5D.4
17.已知函数 SKIPIF 1 < 0 没有极值点,则 SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
18.若 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,平面内一点 SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值是 ( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
19.设正实数 SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则当 SKIPIF 1 < 0 取得最小值时, SKIPIF 1 < 0 的最大值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
20.已知 SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是( )
A.8B.6C.4D.2
第II卷(非选择题)
二、填空题
21.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为______.
22.若 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为________.
23.已知正实数x,y,z满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值为________.
24.已知正实数 SKIPIF 1 < 0 , SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为___________.
25.已知对任意正实数 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,恒有 SKIPIF 1 < 0 ,则实数 SKIPIF 1 < 0 的最小值是___________.
26.已知 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是__________.
27.若实数x,y满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为 ___.
28.若不等式 SKIPIF 1 < 0 对一切正实数 SKIPIF 1 < 0 恒成立,则实数 SKIPIF 1 < 0 的最小值为______.
29.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 且满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为________.
30.已知a,b为正实数,且 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为___________.
31.已知实数x>0,y>0,且满足x2y+xy2﹣11xy+8x+2y=0,则x+y的取值范围是________.
32.已知 SKIPIF 1 < 0 且满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值是___________.
三、解答题
33.已知a,b, SKIPIF 1 < 0 ,求证: SKIPIF 1 < 0 .
34.设a SKIPIF 1 < 0 0,b SKIPIF 1 < 0 0,a+b=2.
(1)证明: SKIPIF 1 < 0 ≥4;
(2)证明:a3+b3≥2.
35.设函数 SKIPIF 1 < 0 .
(1)若 SKIPIF 1 < 0 ,求不等式 SKIPIF 1 < 0 的解集;
(2)若 SKIPIF 1 < 0 (1) SKIPIF 1 < 0 , SKIPIF 1 < 0 ,求 SKIPIF 1 < 0 的最小值.
36.已知a, SKIPIF 1 < 0 ,且 SKIPIF 1 < 0 ,求证: SKIPIF 1 < 0 .
37.设x、y为实数,若 SKIPIF 1 < 0 ,求 SKIPIF 1 < 0 的最大值.
38.设a>0,b>0,且 SKIPIF 1 < 0 + SKIPIF 1 < 0 =1,求证:a+2b SKIPIF 1 < 0 SKIPIF 1 < 0 + SKIPIF 1 < 0 .
39.已知函数 SKIPIF 1 < 0 的最小值为 SKIPIF 1 < 0 .
(I)求 SKIPIF 1 < 0 的值;
(II)当 SKIPIF 1 < 0 时,求证: SKIPIF 1 < 0 .
40.已知 SKIPIF 1 < 0 是正实数.
(1)证明: SKIPIF 1 < 0 ;
(2)若 SKIPIF 1 < 0 ,证明: SKIPIF 1 < 0 .
任务三:邪恶模式(困难)1-20题
1.已知三次函数 SKIPIF 1 < 0 在 SKIPIF 1 < 0 上单调递增,则 SKIPIF 1 < 0 最小值为( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
2.已知函数 SKIPIF 1 < 0 ,若 SKIPIF 1 < 0 SKIPIF 1 < 0 ,其中 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
3.设 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 取得最小值时, SKIPIF 1 < 0 的值为( )
A. SKIPIF 1 < 0 B.2C.4D. SKIPIF 1 < 0
4.已知 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C.0D. SKIPIF 1 < 0
5.若a,b均为正实数,则 SKIPIF 1 < 0 的最大值为 SKIPIF 1 < 0 SKIPIF 1 < 0
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D.2
6.已知 SKIPIF 1 < 0 的内角 SKIPIF 1 < 0 的对边分别是 SKIPIF 1 < 0 且 SKIPIF 1 < 0 ,若 SKIPIF 1 < 0 为最大边,则 SKIPIF 1 < 0 的取值范围是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
7.已知正数 SKIPIF 1 < 0 满足 SKIPIF 1 < 0 , 则 SKIPIF 1 < 0 的最小值是( )
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
8.(改编)已知正数 SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为( )
A. SKIPIF 1 < 0 B.2C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
9.若 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
10.设 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,若三个数 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 能组成一个三角形的三条边长,则实数m的取值范围是 SKIPIF 1 < 0 SKIPIF 1 < 0
A. SKIPIF 1 < 0 B. SKIPIF 1 < 0 C. SKIPIF 1 < 0 D. SKIPIF 1 < 0
第II卷(非选择题)
二、填空题
11.已知实数 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 满足 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值是________.
12.若 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最小值为___________.
13.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,若 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值是________.
14.已知a,b, SKIPIF 1 < 0 ,记 SKIPIF 1 < 0 ,则T最大值为________.
15.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,若 SKIPIF 1 < 0 ,则 SKIPIF 1 < 0 的最大值是________.
三、解答题
16.已知函数 SKIPIF 1 < 0 .
(1)求不等式 SKIPIF 1 < 0 的最小整数解 SKIPIF 1 < 0 ;
(2)在(1)的条件下,对任意 SKIPIF 1 < 0 , SKIPIF 1 < 0 ,若 SKIPIF 1 < 0 ,求 SKIPIF 1 < 0 的最小值.
17.已知a,b,c均为正实数,且满足 SKIPIF 1 < 0 .
证明:(1) SKIPIF 1 < 0 ;
(2) SKIPIF 1 < 0 .
18.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 为正数,且满足 SKIPIF 1 < 0 ,证明:
(1) SKIPIF 1 < 0 ;
(2) SKIPIF 1 < 0 .
19.已知 SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 , SKIPIF 1 < 0 .
SKIPIF 1 < 0 证明: SKIPIF 1 < 0 .
SKIPIF 1 < 0 证明: SKIPIF 1 < 0 .
20.已知实数 SKIPIF 1 < 0 满足 SKIPIF 1 < 0 .
(1)若 SKIPIF 1 < 0 ,求 SKIPIF 1 < 0 的最小值;
(2)若 SKIPIF 1 < 0 ,求 SKIPIF 1 < 0 的最小值,
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