A.若a>b,则ac2>bc2 | ||||
B.-2<a<3,1<b<2,则-3<a-b<1 | ||||
C.若a>b>0,m>0,则
| ||||
D.若a>b,c>d,则ac>bd |
1 |
a |
1 |
b |
m |
a |
m |
b |
1 |
2 |
A.①②③④ | B.①③④ | C.②③④ | D.①④ |
x2+4 | ||
|
A.若d<0,则列数{Sn}有最大项 |
B.若数列{Sn}有最大项,则d<0 |
C.若数列{Sn}是递增数列,则对任意n∈N*,均有Sn>0 |
D.若对任意n∈N*,均有Sn>0,则数列{Sn}是递增数列 |
a |
b |
a |
b |
0 |
OA |
OB |
OC |
0 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
0 |
c |
a |
c |
b |
c |
0 |
A.1 | B.2 | C.3 | D.4 |
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