问题 选择题
已知命题p:∀x1,x2∈R,(f(x2)-f(x1))(x2-x1)≥0,则¬p是(  )
A.∃x1,x2∈R,(f(x2)-f(x1))(x2-x1)≤0
B.∀x1,x2∈R,(f(x2)-f(x1))(x2-x1)≤0
C.∃x1,x2∈R,(f(x2)-f(x1))(x2-x1)<0
D.∀x1,x2∈R,(f(x2)-f(x1))(x2-x1)<0
答案

答案:C

计算题