A.椭圆的离心率大于1 | ||||
B.双曲线
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C.∀a,b∈R,
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D.∃x∈R,sinx+cosx=
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x2 |
m2 |
y2 |
n2 |
y2 |
n2 |
x2 |
m2 |
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π |
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7 |
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2 |
A.0 | B.1 | C.2 | D.3 |
A.“a=1”是直线“l1:ax+2y-1=0与直线l2:x+(a+1)y+4=0平行”的充要条件 |
B.命题“∃x∈R,x2-x>0”的否定是“∀x∈R,x2-x>0” |
C.命题“若m>0,则方程x2+x-m=0有实数根”的逆否命题为:“若方程x2+x-m=0无实数根,则m≤0” |
D.若p∧q为假命题,则p,q均为假命题 |
A.∀x∈R,有(x-
| B.∀x∈Q,有x2>0 | ||
C.∃x∈Z,使3x=128 | D.∃x∈R,使3x2-4=6x |
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