A.命题p:∀x∈R,x2-x+
| ||||
B.命题“若x=1,则x2=1”的否命题 | ||||
C.∃x∈R,x2≥x | ||||
D.y=3x5是幂函数,函数f(x)=2x-x2的零点有2个 |
1 |
4 |
1 |
4 |
A.若a⊂α,b⊂α,c⊥a,c⊥b 则c⊥α |
B.若b⊂α,a∥b 则 a∥α |
C.若a∥α,α∩β=b 则a∥b |
D.若a⊥α,b⊥α 则a∥b |
A.①② | B.②③ | C.①③ | D.③④ |
a |
b |
b |
a |
a |
0 |
a |
b |
| ||
|
OP |
OA |
OB |
A.0个 | B.1个 | C.2个 | D.3个 |
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