问题 解答题
计算下面各题,怎样简便就怎样算.
15×
3
8
÷
9
4
20×(
2
5
+
1
6
-
4
15
3
5
×
7
13
+
3
5
×
6
13
10-(
4
3
+
1
3
×2)
答案

(1)15×

3
8
÷
9
4

=

45
8
÷
9
4

=2

1
2

(2)20×(

2
5
+
1
6
-
4
15

=20×(

17
30
-
4
15

=20×

3
10

=6;

(3)

3
5
×
7
13
+
3
5
×
6
13

=

3
5
×(
7
13
+
6
13

=

3
5
×1

=

3
5

(4)10-(

4
3
+
1
3
×2)

=10-(

4
3
+
2
3

=10-2

=8.

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