题目内容

(1)42
5
13
×(7
1
8
-7.125)÷3
2
3

(2)3.75×4
3
7
-3
3
4
×3
3
7

(3)11
5
6
-2
1
4
-5
1
2
÷1
1
8

(4)1
3
4
÷1
1
3
+8÷5×
3
4

(5)(2÷
2
3
-
2
3
÷2)×1
1
2

(6)20×
2
5
-0.27÷
1
3
+6.81

(7)(
1
3
+
1
7
)×21÷(2.5×1
3
4
)

(8)8.1÷[(4
1
7
-0.005×700)÷1
2
7
]
(1)42
5
13
×(7
1
8
-7.125)÷3
2
3

=42
5
13
×0÷3
2
3

=0;

(2)3.75×4
3
7
-3
3
4
×3
3
7

=3
3
4
×4
3
7
-3
3
4
×3
3
7

=3
3
4
×(4
3
7
-3
3
7
),
=3
3
4
×1,
=3
3
4


(3)11
5
6
-2
1
4
-5
1
2
÷1
1
8

=11
5
6
-2
1
4
-
44
9

=
115
12
-
44
9

=4
25
36

(4)1
3
4
÷1
1
3
+8÷5×
3
4

=
21
16
+
8
5
×
3
4

=
21
16
+
6
5

=2
41
80


(5)(2÷
2
3
-
2
3
÷2)×1
1
2

=(3-
1
3
)×
3
2

=
8
3
×
3
2

=4;
(6)20×
2
5
-0.27÷
1
3
+6.81

=8-0.81+6.81,
=7.19+6.81,
=14;

(7)(
1
3
+
1
7
)×21÷(2.5×1
3
4
)

=(
1
3
×21+
1
7
×21)÷
35
8

=(7+3)÷
35
8

=10÷
35
8

=2
2
7


(8)8.1÷[(4
1
7
-0.005×700)÷1
2
7
]

=8.1÷[(4
1
7
-3.5)÷1
2
7
],
=8.1÷[
9
14
÷
9
7
],
=8.1÷
1
2

=16.2.
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