A.1 | B.2 | C.3 | D.4 |
a1+a3 |
2 |
a1+4 |
2 |
A.①③ | B.①④ | C.②③ | D.②④ |
A.命题“∀x∈R,ex>0”的否定是“∃x∈R,ex>0” |
B.命题“已知x,y∈R,若x+y≠3,则x≠2或y≠1”是真命题 |
C.“x2+2x≥ax在x∈[1,2]上恒成立”⇔“(x2+2x)min≥(ax)max在x∈[1,2]上恒成立” |
D.命题“若a=-1,则函数f(x)=ax2+2x-1只有一个零点”的逆命题为真命题 |
π |
3 |
π |
6 |
a |
b |
a |
c |
a |
0 |
a |
b |
c |
b |
c |
s10 |
10 |
s100 |
100 |
s110 |
110 |
A.(1)(2) | B.(3)(4) | C.(2)(3) | D.(1)(4) |
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