问题 解答题
脱式计算
4.85-
5
9
+5.15-
4
9
              
1
13
+
12
13
×(
5
2
-
1
3

5×(
1
15
+
2
17
)×17          
3
4
÷[(
4
5
+
1
4
3
7
]
答案

(1)4.85-

5
9
+5.15-
4
9

=(4.85+5.15)-(

5
9
+
4
9
),

=10-1,

=9;

(2)

1
13
+
12
13
×(
5
2
-
1
3

=

1
13
+
12
13
×
5
2
-
12
13
×
1
3

=

1
13
+
30
13
-
4
13

=

27
13

(3)5×(

1
15
+
2
17
)×17

=5×17×(

1
15
+
2
17
),

=85×

1
15
+85×
2
17

=

17
3
+ 10,

=15

2
3

(4)

3
4
÷[(
4
5
+
1
4
)×
3
7
]

=

3
4
÷
3
7
÷
4
5
+
1
4
),

=

7
4
÷
21
20

=

5
3

单项选择题
多项选择题