题目内容

3×(
2
15
+
1
12
)-
2
5
[
1
2
-(
3
4
-
3
5
)]÷
7
10
4.5×3.7+4
1
2
×1.3
4
9
÷[2
2
5
-(
1
5
+
1
3
)]
3
4
×
9
5
-
3
4
÷
10
13
4
2
5
×170%+6.3×4
2
5
-2.5.
(1)3×(
2
15
+
1
12
)-
2
5

=3×
2
15
+3×
1
12
-
2
5

=
2
5
+
1
4
-
2
5

=
2
5
-
2
5
+
1
4

=0+
1
4

=
1
4


(2)[
1
2
-(
3
4
-
3
5
)]÷
7
10

=[
1
2
-
3
20
7
10

=
7
20
÷
7
10

=
1
2


(3)4.5×3.7+4
1
2
×1.3,
=4.5×(3.7+1.3),
=4.5×5,
=22.5;

(4)
4
9
÷[2
2
5
-(
1
5
+
1
3
)],
=
4
9
÷[2
2
5
-
1
5
-
1
3
],
=
4
9
÷[2
1
5
-
1
3
],
=
4
9
÷
26
15

=
10
39


(5)
3
4
×
9
5
-
3
4
÷
10
13

=
3
4
×
9
5
-
3
4
×
13
10

=
3
4
×(
9
5
-
13
10
),
=
3
4
×
1
2

=
3
8


(6)4
2
5
×170%+6.3×4
2
5
-2.5,
=4
2
5
×(1.7+6.3)-2.5,
=4
2
5
×8-2.5,
=35.2-2.5,
=32.7.
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