问题:
下列判断中,正确的个数为( )
①若-a>b>0,则ab<O
②若ab>0,则a>0,b>0
③若a>b,c≠0,则ac>bc
③若a>b,c≠0,则ac 2>bc 2
⑤若a>b,c≠0,则-a-c<-b-c.
A.2
B.3
C.4
D.5
下列判断中,正确的个数为( )
①若-a>b>0,则ab<O
②若ab>0,则a>0,b>0
③若a>b,c≠0,则ac>bc
③若a>b,c≠0,则ac 2>bc 2
⑤若a>b,c≠0,则-a-c<-b-c.
①若-a>b>0,则ab<O
②若ab>0,则a>0,b>0
③若a>b,c≠0,则ac>bc
③若a>b,c≠0,则ac 2>bc 2
⑤若a>b,c≠0,则-a-c<-b-c.
A.2 | B.3 | C.4 | D.5 |
参考答案: