问题 解答题
脱式计算.(能简便的用简便方法计算)
12.53-1.35×2-9.3
0.8÷(4-3.75)÷0.1
4
5
+
11
15
+
3
10
7-(
3
4
-
2
5
)
11
12
+
5
8
+
3
8
+
1
12
10-
6
7
-
1
7
答案

(1)12.53-1.35×2-9.3,

=12.53-2.7-9.3,

=12.53-(2.7+9.3),

=12.53-12,

=0.53;

(2)0.8÷(4-3.75)÷0.1,

=0.8÷0.25÷0.1,

=3.2÷0.1,

=32;

(3)

4
5
+
11
15
+
3
10

=

24
30
+
22
30
+
9
30

=

11
6

(4)7-(

3
4
-
2
5
),

=7-

7
20

=6

13
20

(5)

11
12
+
5
8
+
3
8
+
1
12

=(

11
12
+
1
12
)+(
5
8
+
3
8
),

=1+1,

=2;

(6)10-

6
7
-
1
7

=10-(

6
7
+
1
7
),

=10-1,

=9.

单项选择题
单项选择题