题目内容

4
5
9
×25+15
4
9
×25)÷(4
1
10
-3
9
16

(1
2
25
-0.28)×
5
13
+1÷(0.75+
1
3

6
1
4
-6.3×(6
2
5
÷6.4)÷1
4
5

11
1
9
÷(7.35-5
1
12
)+82.5×
3
5
①(4
5
9
×25+15
4
9
×25)÷(4
1
10
-3
9
16
),
=25×(4
5
9
+15
4
9
)÷(1
1
10
-
9
16
),
=25×20÷(
88
80
-
45
80
),
=500÷
43
80

=500×
80
43

=930
10
43


②(1
2
25
-0.28)×
5
13
+1÷(0.75+
1
3
),
=(
27
25
-
7
25
)×
5
13
+1÷(
9
12
+
4
12
),
=
20
25
×
5
13
+
12
13

=
4
13
+
12
13

=
16
13

=1
3
13


③6
1
4
-6.3×(6
2
5
÷6.4)÷1
4
5

=6
1
4
-6.3×1×
5
9

=6.25-3.5,
=2.75;

④11
1
9
÷(7.35-5
1
12
)+82.5×
3
5

=
100
9
÷(7
21
60
-5
5
60
)+49.5,
=
100
9
÷
136
60
+49.5,
=
100
9
×
15
34
+
99
2

=
250
51
+
99
2

=
500
102
+
5049
102

=
5549
102

=54
41
102
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