A.若a>b,则ac>bc | B.若a>b>0,则a2>b2 | ||
C.若|x-3|>1,则2<x<4 | D.若
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A.1 | B.2 | C.3 | D.4 |
a99-1 |
a100-1 |
A.①②④ | B.②④ | C.①② | D.①②③④ |
A.①② | B.①③ | C.②③ | D.①②③ |
A.若p且q为真命题,则p、q均为真命题 |
B.“x>2”是“x2-3x+2>0”的充分不必要条件 |
C.命题p:存在x0∈R,使得x02+x0+1<0,则¬p:任意x∈R,都有x2+x+1≥0 |
D.若f′(x0)=0,则f(x0)是函数f(x)的极值 |
A.x>9 |
B.他还年青 |
C.20-5×3=10 |
D.2020年前建立北斗导航系统 |
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