题目内容

合理计算:
1.05+1.42÷(4.3+2.8)
8.4×
1
4
+1.6×0.25

2
3
-
3
8
÷
9
10
+
1
4

(
14
15
-
14
15
×
3
8
5
9

5-
6
13
÷
9
26
-
4
3

[
1
2
-(
3
4
-
3
5
)]÷
7
10
1.05+1.42÷(4.3+2.8),
=1.05+1.42÷7.1,
=1.05+0.2,
=1.25;

8.4×
1
4
+1.6×0.25,
=8.4×0.25+1.6×0.25,
=(8.4+1.6)×0.25,
=10×0.25,
=2.5;

2
3
-
3
8
÷
9
10
+
1
4

=
2
3
-
3
8
×
10
9
+
1
4

=
2
3
-
5
12
+
1
4

=
8
12
-
5
12
+
3
12

=
1
2


14
15
-
14
15
×
3
8
)÷
5
9

=(1-
3
8
)×
14
15
×
9
5

=
5
8
×
14
15
×
9
5

=1
1
20


5-
6
13
÷
9
26
-
4
3

=5-
6
13
×
26
9
-
4
3

=5-
4
3
-
4
3

=5-(
4
3
+
4
3
),
=5-
8
3

=2
1
3


[
1
2
-(
3
4
-
3
5
)]÷
7
10

=[
1
2
-
3
20
]÷
7
10

=
7
20
×
10
7

=
1
2
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