2 |
9 |
a |
3 |
a |
3 |
a |
3 |
2 |
9 |
1 |
3 |
1 |
3 |
1 |
3 |
a |
3 |
a |
3 |
a |
3 |
a3 |
27 |
a2 |
9 |
a |
3 |
2a |
9 |
a3 |
27 |
a2 |
9 |
a |
9 |
a |
3 |
-3-
| ||
2 |
-3+
| ||
2 |
-3+
| ||
2 |
1 |
3 |
1 |
3 |
a |
3 |
1 |
3 |
1 |
27 |
1 |
9 |
1 |
3 |
2 |
9 |
1 |
3 |
5 |
2 |
5 |
2 |
-3+
| ||
2 |
5 |
2 |
2a |
x |
2a |
x |
3 | a2 |
x |
2 |
|
A.P2,P4 | B.P2,P3 | C.P1,P4 | D.P1,P3 |
E.P2,P4 |
A.∃x∈R,使得2x>0” | B.∃x∈R,使得2x≥0” |
C.∀x∈R,有2x>0 | D.∀x∈R,有2x≥0 |
π |
2 |
A.∀ x∈[0,
| B.∃ x∈[0,
| ||||
C.∃ x∈[0,
| D.∃ x∈[0,
|
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