试题:
计算下面各题,能简算的要简算:
7.54+
12
7
+2.46+
16
7

0.4÷
15
4
+
2
5
×
4
15

3
23
÷(
6
7
-
5
6
×
3
10
)

99×
23
25
+
23
25

答案:

我来补答
7.54+
12
7
+2.46+
16
7

=(7.54+2.46)+(
12
7
+
16
7
),
=10+4,
=14;

0.4÷
15
4
+
2
5
×
4
15

=
2
5
×
4
15
+
2
5
×
4
15

=
2
5
×(
4
15
+
4
15
),
=
2
5
×
8
15

=
16
75


3
23
÷(
6
7
-
5
6
×
3
10
)

=
3
23
÷(
6
7
-
1
4
),
=
3
23
÷
17
28

=
84
391


99×
23
25
+
23
25

=(99+1)×
23
25

=100×
23
25

=92.
 
 
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