题目内容

计算下面各题(能简算的要使用简便算法).
3
10
×(
5
7
-
10
21
6
13
÷7+
1
7
×
8
13
1
8
+
1
3
-
1
4
)÷
1
24
5
7
÷
4
21
÷
15
16

(1)
3
10
×(
5
7
-
10
21
),
=
3
10
×
5
21

=
1
14


(2)
6
13
÷7+
1
7
×
8
13

=
6
13
×
1
7
+
1
7
×
8
13

=(
6
13
+
8
13
)×
1
7

=
14
13
×
1
7

=
2
13


(3)(
1
8
+
1
3
-
1
4
)÷
1
24

=(
1
8
+
1
3
-
1
4
)×24,
=
1
8
×24+
1
3
×24-
1
4
×24,
=3+8-6,
=11-6,
=5;

(4)
5
7
÷
4
21
÷
15
16

=
15
4
÷
15
16

=4.
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