题目内容

计算下面各题,能简算的要简算.
(1)
10
21
÷
5
9

(2)39÷
26
25

(3)
4
5
÷14÷
7
10

(4)
8
9
×
3
4
÷
8
15

(5)(
7
8
+
13
16
)÷
13
16

(6)
1
2
×
4
7
+
1
2
×
4
7
(1)
10
21
÷
5
9
=
6
7

(2)39÷
26
25
=37.5,
(3)
4
5
÷14÷
7
10

=
2
35
÷
7
10

=
4
49


(4)
8
9
×
3
4
÷
8
15

=
2
3
÷
8
15

=1
1
4


(5)(
7
8
+
13
16
)÷
13
16

=
7
8
×
16
13
+
13
16
×
16
13

=1
1
13
+1,
=2
1
13


(6)
1
2
×
4
7
+
1
2
×
4
7

=(
1
2
+
1
2
)×
4
7

=1×
4
7

=
4
7
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