3B |
2 |
C |
2 |
π |
6 |
π |
4 |
a |
b |
2 |
3 |
|
π |
6 |
π |
4 |
3B |
2 |
C |
C |
π |
2 |
3B |
2 |
C |
2 |
π |
6 |
π |
4 |
a |
b |
sin2B |
sinB |
π |
6 |
π |
4 |
2? |
3? |
a |
b |
2 |
3 |
A.一个命题的逆命题为真,则它的否命题为假 |
B.一个命题的逆命题为真,则它的逆否命题为真 |
C.一个命题的逆否命题为真,则它的否命题为真 |
D.一个命题的否命题为真,则它的逆命题为真 |
A.0 | B.1 | C.2 | D.3 |
1 |
a |
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