f(-x) |
f(x) |
f(-x) |
f(x) |
f(-x) |
f(x) |
π |
2 |
π |
6 |
π |
6 |
π |
6 |
π |
6 |
A.若l∥α,且l∥β,则α∥β | B.若l⊥α.且l⊥β,则α∥β |
C.若l⊂α,且α⊥β,则l⊥β | D.若l∥α,且α∥β,则l∥β |
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 |
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 |
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