问题 解答题
计算下列各题.(能简算的要简算)
4
5
-
4
15
×
3
8
÷
3
10

3
8
×
1
7
+
3
8
×
5
7

13
8
×7.83-
5
8
×7.83

2
7
÷(
2
5
+
1
3
)
答案

(1)

4
5
-
4
15
×
3
8
÷
3
10

=

4
5
-
1
10
÷
3
10

=

4
5
-
1
3

=

7
15

(2)

3
8
×
1
7
+
3
8
×
5
7

=

3
8
×(
1
7
+
5
7
),

=

3
8
×
6
7

=

9
28

(3)

13
8
×7.83-
5
8
×7.83,

=(

13
8
-
5
8
)×7.83,

=1×7.83,

=7.83;

(4)

2
7
÷(
2
5
+
1
3
),

=

2
7
÷
11
15

=

30
77

单项选择题
判断题