题目内容

计算下列各题
5
12
+3
5
24
+
7
13
+1
6
13

11
2
7
-2
4
5
+3
5
7
-0.2

25×3
1
3
×0.4×
3
10

7.8÷[32×(1-
5
8
)+3.6]
(1)
5
12
+3
5
24
+
7
13
+1
6
13

=(
10
24
+3
5
24
)+(
7
13
+1
6
13
),
=3
5
8
+2,
=5
5
8


(2)11
2
7
-2
4
5
+3
5
7
-0.2,
=(11
2
7
+3
5
7
)-(2
4
5
+
1
5
),
=15-3,
=12;

(3)25×3
1
3
×0.4×
3
10

=25×
10
3
×0.4×
3
10

=(25×0.4)×(
10
3
×
3
10
),
=10×1,
=10;

(4)7.8÷[32×(1-
7
8
)+3.6],
=7.8÷[32×
1
8
+3.6],
=7.8÷7.6,
=
39
38

=1
1
38
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