| ||
2 |
A.4 | B.3 | C.2 | D.1 |
1 |
2 |
| ||
2 |
| ||
2 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
AB |
CD |
a |
b |
b |
c |
a |
c |
A.0 | B.1 | C.2 | D.3 |
A.3 | B.2 | C.1 | D.0 |
A.1 | B.2 | C.3 | D.4 |
A.命题“若x2=1,则x=1”的否命题为“若x2=1,则x≠1” |
B.命题“若x=y,则x2=y2”的逆否命题是假命题 |
C.命题“若a2+b2≠0,则a,b全不为0”为真命题 |
D.命题“若α≠β”,则cosα≠cosβ”的逆命题为真命题 |
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