A.[2,6] | B.[-6,-2] | C.(2,6) | D.(-6,-2) |
x | 20 |
x | 20 |
x | 20 |
x | 20 |
A.∃x∈Z,x2+2x+1>0 | B.不存在x∈Z使x2+2x+1>0 |
C.∀x∈Z,x2+2x+1≤0 | D.∀x∈Z,x2+2x+1>0 |
A.∀x∈R,x2+2<2x | B.∃x0∈Rx02+2≤2x0 |
C.∃x0∈RX02+2<2x0 | D.∀x∈Rx2+2≤2x |
A.[-2
| B.[-2,2] | C.[-
| D.(-2
|
© 2017-2019 超级试练试题库,All Rights Reserved.