课堂反馈
1
.
计算
a
5
÷a
3
结果正确的是
(
)
A
.
a B
.
a
2
C
.
a
3
D
.
a
4
B
2
.
计算:
(
-
2)
6
÷(
-
2)
2
=
________
.
16
3
.
计算:
x
4
·x
2
÷x
3
=
________
.
x
3
4
.
已知
a
m
=
6
,
a
n
=
3
,
则
a
m
+
n
=
________
,
a
m
-
n
=
________
.
18
2
5
.
计算下列各题.
(1)a
6
÷(
-
a)
4
;
(2)a
2m
÷a
1
-
m
;
(3)x
8
÷(x
5
÷x
2
)
.
(1)
a
2
(2)
a
3
m
-
1
(3)
x
5