A.∃(x,y),x,y∈R,2x+3y+3>0 |
B.∃(x,y),x,y∈R,2x+3y+3≥0 |
C.∀(x,y),x,y∈R,2x+3y+3≥0 |
D.∀(x,y),x,y∈R,2x+3y+3>0 |
A.(p)∨q | B.p∧q |
C.(p)∧(q) | D.(p)∨(q) |
A.q1,q3 | B.q2,q3 | C.q1,q4 | D.q2,q4 |
A.①② | B.①③ | C.③④ | D.②④ |
A.x∈R,使得sinxcosx= |
B.x∈(-∞,0),2x>1 |
C.x∈R,x2≥x+1 |
D.x∈(0,),tanx>sinx |
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