A.若a>b>c>0,则ac>bc | B.若a∈R,则a2+2+
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C.若|a|>|b|,则a2>b2 | D.若a≥0,b≥0,则a+b≥2
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1 |
t |
1 |
t2 |
1 |
2 |
5 |
2 |
A.已知p:
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B.存在实数x∈R,使sinx+cosx=
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C.命题p:对任意的x∈R,x2+x+1>0,则-p:对任意的x∈R,x2+x+1≤0 | ||||
D.若p或q为假命题,则p,q均为假命题 |
1 |
2 |
A.1 | B.2 | C.3 | D.4 |
A.若x2=1,则x=1 | B.若x=y,则
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C.若
| D.若x<y,则x2<y2 |
A.若a>b,c>d,则ac>bc | B.若ac>bc,则a<b | ||||
C.若
| D.若a>b,c>d,则a-c>b-d |
A.y=sinx+cosx是周期函数 |
B.1是方程x2-1=0的根 |
C.15能被3或4整除 |
D.梯形是等腰梯形 |
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