题目内容

计算下面各题,能简算的要简算.
(1)1
5
13
×9+1
5
13
×17

(2)12
1
2
×3.5×
2
35

(3)
5
16
×1
1
3
×
3
5
÷
2
15

(4)[5
4
15
-(0.25+
1
3
)×7.2]÷2
4
5

(5)(3
5
6
-1
3
4
)×2
2
5
÷4
1
2

(6)2
1
4
÷[(2
1
3
-1.2)×
3
4
+0.05]
(1)1
5
13
×9+1
5
13
×17

=(9+17)×
18
13

=26×
18
13

=36;

(2)12
1
2
×3.5×
2
35

=
25
2
×(3.5×
2
35
),
=
25
2
×
2
10

=2.5;

(3)
5
16
×1
1
3
×
3
5
÷
2
15

=(
5
16
×
4
3
)×(
3
5
×
15
2
),
=
5
12
×
9
2

=1
7
8


(4)[5
4
15
-(0.25+
1
3
)×7.2]÷2
4
5

=[
79
15
-(
1
4
+
1
3
)×7.2]÷
14
5

=[
79
15
-
7
12
×7.2]×
5
14

=[
79
15
-
21
5
5
14

=
16
15
×
5
14

=
8
21


(5)(3
5
6
-1
3
4
)×2
2
5
÷4
1
2

=(
23
6
-
7
4
)×
12
5
÷
9
2

=(
23
6
×
12
5
-
7
4
×
12
5
)×
2
9

=(
46
5
-
21
5
)×
2
9

=5×
2
9

=1
1
9


(6)2
1
4
÷[(2
1
3
-1.2)×
3
4
+0.05]

=
9
4
÷[(
7
3
-
6
5
)×
3
4
+
1
20
],
=
9
4
÷[
17
15
×
3
4
+
1
20
],
=
9
4
÷[
17
20
+
1
20
],
=
9
4
÷
9
10

=
9
4
×
10
9

=2.5.
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