的结果是( )
B . -
C .
D .
得 .
=2
B .
=0
C .
=1
D .
=-1
的结果是 .
=; ②
=.
=;
=;
=;
=.
① | ② | ③ |
④ | ⑤ | ⑥ |
⑦ | ⑧ | ⑨ |
⑩ | ⑪ | ⑫ |
B .
=﹣1
C .
=
D .
=
=.
=1
B .
=-1
C .
=
D .
=
.
=;②
=.
<1,则m=
,则m的取值范围是.
=.
B .
C .
D .
.
B .
C .
D .
B .
C .
D .
, 则分式
的值为.
B .
C .
D .