a2 |
A.∀a∉Q,
| B.∃a∈Q,
| C.∃a∈Q,
| D.∀a∉Q,
|
a2 |
a2 |
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 |
A.∀x∈R,x2+x-2<0 | B.∃x∈R,x2+x-2≥0 |
C.∃x∈R,x2+x-2≤0 | D.∃x∈R,x2+x-2<0 |
A.∀x∈R,2x≤0 | B.∃x∈R,2x>0 | C.∃x∈R,2x≤0 | D.∀x∈R,2x>0 |
A.函数f(x)=ax+1(a>0且a≠1)的图象恒过点(0,1) |
B.函数f(x)=xa(a<0)在其定义域上是减函数 |
C.命题“∀x∈R,x2+x+1<0”的否定是:“∃x∈R,x2+x+1>0” |
D.给定命题p、q,若¬p是假命题,则“p或q”为真命题 |
2 |
9 |
a |
3 |
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