单选题 容易0.94 引用37 组卷3316
已知命题p:x1,x2R,(f(x2)f(x1))(x2x1)≥0,则p是
A.x1,x2R,(f(x2)f(x1))(x2x1)≤0 |
B.x1,x2R,(f(x2)f(x1))(x2x1)≤0 |
C.x1,x2R,(f(x2)f(x1))(x2x1)<0 |
D.x1,x2R,(f(x2)f(x1))(x2x1)<0 |
2012·辽宁·高考真题
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已知命题p:∀x1,x2∈R,[f(x)1-f(x2)](x1-x2)≥0,则﹁p是( )
A.∃x1,x2∉R,[f(x)1-f(x2)](x1-x2)<0 |
B.∃x1,x2∈R,[f(x)1-f(x2)](x1-x2)<0 |
C.∀x1,x2∉R,[f(x)1-f(x2)](x1-x2)<0 |
D.∀x1,x2∈R,[f(x)1-f(x2)](x1-x2)<0 |
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