x3
=6
B . ﹣(﹣a+1)=a﹣1
C . 3m2﹣m2=3
D . (﹣
)2=﹣3
﹣3
=3(a≥0)
D .
=
(a≥0,b>0)
)2=.
的结果是( )
B . ﹣
C . ﹣
D . ﹣
=( )
B .
C .
D .
=
+
B . 3
-
=3
C .
×
=7
D .
÷
=2
等于( )
B .
C .
D .
B .
C .
D .
=.
÷
=2
B . 2
×
=
C . a2﹣a3=a6
D . (a2)3=a8
;求:
的值.
B .
C .
D .
B .
C .
D .
.
B .
C .
D .
B .
C .
D .
B .
C .
D .
;
.