问题 解答题
下列各题怎样简算就怎样算.
2
5
×4×
3
4

5
6
×
5
9
+
5
9
×
1
6

37
5
×
1
4
+
1
4
×
13
5
+
1
4

(13+
13
15
)÷13.
答案

(1)5×4×

3
4

=5×(4×

3
4

=5×3

=15;

(2)

5
6
×
5
9
+
5
9
×
1
6

=(

5
6
+
1
6
)×
5
9

=1×

5
9

=

5
9

(3)

37
5
×
1
4
+
1
4
×
13
5
+
1
4

=(

37
5
+
13
5
+1)×
1
4

=11×

1
4

=2

3
4

(4)(13+

13
15
)÷13

=13×

1
13
+
13
15
×
1
13

=1+

1
15

=1

1
15

单项选择题
单项选择题