问题 解答题
计算下面各题,怎样计算简便就怎样计算.
8
9
×
2
5
÷
8
15

2
3
+(
4
7
+
1
2
)×
7
25

8
13
÷7+
1
7
×
5
13
答案

(1)

8
9
×
2
5
÷
8
15

=

8
9
×
2
5
×
15
8

=

8
9
×
15
8
×
2
5

=

5
3
×
2
5

=

2
3

(2)

2
3
+(
4
7
+
1
2
)×
7
25

=

2
3
+
15
14
×
7
25

=

2
3
+
3
10

=

29
30

(3)

8
13
÷7+
1
7
×
5
13

=

8
13
×
1
7
+
1
7
×
5
13

=(

8
13
+
5
13
)×
1
7

=1×

1
7

=

1
7

单项选择题
填空题