+2
=3
B .
= 4
C .
÷
=3
D .
=±5
B .
(
>0)
C .
=
D .
=.
=a+b
B .
=
C .
=
D .
=0
×
=.
中的m移进根号内结果是( )
B .
C . ﹣
D . |
|
=2
B .
=
C .
×
=
D .
÷
=
=2
B .
×
=2
C . (
2=7
D . (﹣2ab2)3=﹣6a3b6
;
.
B .
C .
D .
B .
C .
D .
=﹣2
B .
+
=
C .
×
=4
D . 2
﹣
=2
, 则
的值为( )
B . 9
C .
D . 6
B .
C . 2cos 60°=
D .
=
=
B .
C .
=
=x
D . 3
﹣2
=1
;
.
B .
C .
D .
的值是( )
B .
C .
D .
B .
C .
D .