问题 解答题
下面各题怎样算简便就怎样算.
2
5
×15÷
5
8
1
4
+
3
4
÷
3
8
12
5
-
3
5
3
7
×
1
3
+
4
7
×
1
3
1
2
+
1
3
+
1
6
)×18.
答案

(1)

2
5
×15÷
5
8

=

2
5
×15×
8
5

=

48
5

(2)

1
4
+
3
4
÷
3
8

=

1
4
+2,

=2

1
4

(3)4÷

12
5
-
3
5

=

5
3
-
3
5

=

16
15

(4)

3
7
×
1
3
+
4
7
×
1
3

=(

3
7
+
4
7
)×
1
3

=1×

1
3

=

1
3

(5)(

1
2
+
1
3
+
1
6
)×18,

=

1
2
×18+
1
3
×18+
1
6
×18,

=9+6+3,

=18.

单项选择题
单项选择题