问题 解答题
下面各题,怎样算简便就怎样算:
1
3
÷(
2
3
-
2
5
)×
3
5

12
15
×(
5
6
+
3
4
)+
4
5

7
9
÷
11
5
+
2
9
×
5
11
答案

(1)

1
3
÷(
2
3
-
2
5
)×
3
5

=

1
3
÷
4
15
×
3
5

=

1
3
×
15
4
×
3
5

=

3
4

(2)

12
15
×(
5
6
+
3
4
)+
4
5

=

12
15
×
19
12
+
4
5

=

19
15
+
4
5

=

31
15

(3)

7
9
÷
11
5
+
2
9
×
5
11

=

7
9
×
5
11
+
2
9
×
5
11

=(

7
9
+
2
9
)×
5
11

=1×

5
11

=

5
11

单项选择题
单项选择题 案例分析题