3n+7 |
n+1 |
3n+7 |
n+1 |
3(n+1)+4 |
n+1 |
4 |
n+1 |
A.α⊥γ且β⊥γ | B.m⊂α,n⊂β,m∥n |
C.m⊥α 且m⊥β | D.m⊂α,n⊂α,m∥β,n∥β |
π |
2 |
π |
2 |
π |
12 |
π |
3 |
π |
6 |
A.命题“若x2-3x+2=0则x=1”的逆否命题为:“若x≠1,则x2-3x+2≠0” |
B.“x=1”是“x2-3x+2=0”的充分不必要条件 |
C.对于命题p:∃x0∈R,x02+x0+1<0.则¬p:∀x∈R,x2+x+1≥0 |
D.若p∧q为假命题,则p、q均为假命题 |
A.(1)(2) | B.(2)(3) | C.(1)(2)(3) | D.(3)(4) |
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