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命题“存在x∈R,使得|x-1|-|x+1|>3”的否定是 .
命题“存在x∈R,使得|x-1|-|x+1|>3”的否定是 .
考点分析:
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由直线x+y+1=0,x-y=-1,2x-y=2围成的三角形区域(包括边界)用不等式(组)可表示为
.
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已知命题p:∃x∈R,使tanx=1,命题q:x
2-3x+2<0的解集是{x|1<x<2},下列结论:
①命题“p∧q”是真命题;
②命题“p∧¬q”是假命题;
③命题“¬p∨q”是真命题;
④命题“¬p∨¬q”是假命题.
其中正确的是
.
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椭圆
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的焦点在y轴上,长轴长是短轴长的2倍,则m=
.
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已知正项等比数列{a
n}满足S
8=17S
4,若存在两项a
m,a
n使得
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,则
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的最小值是( )
A.
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B.
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C.
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D.
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已知点P是双曲线
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右支上一点,F
1、F
2分别是双曲线的左、右焦点,I为△PF
1F
2的内心,若
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成立,则双曲线的离心率为( )
A.4
B.
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C.2
D.
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