A.若a>b>0,c<0,则
| B.若a>b>0,c>d,则ac>bd. | ||||
C.若a>b,c>d,则a-c<b-d. | D.若a>b,ab>0,则
|
1 |
a |
1 |
b |
c |
a |
c |
b |
1 |
a |
1 |
b |
1 |
a |
1 |
b |
A.1 | B.2 | C.3 | D.4 |
1 |
ac |
1 |
a |
a |
b |
A.a+b>0 | B.ac<bc | C.a-b<0 | D.a2<b2 |
a+7 |
a+4 |
a+3 |
a |
A.P>Q | B.P=Q |
C.P<Q | D.由a的取值确定 |
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