题目内容

450÷18×25
5
8
×
1
4
+
1
4
×
3
8
﹙0.75-
3
16
﹚×﹙
2
9
+
1
3
2
9
×0.375÷
6
7
12×﹙
1
4
+
1
6
-
1
3
1
15
÷[﹙
2
3
+
1
5
﹚×
1
26
].
(1)450÷18×25,
=25×25,
=625;

(2)
5
8
×
1
4
+
1
4
×
3
8

=(
5
8
+
3
8
)×
1
4

=1×
1
4

=
1
4


(3)﹙0.75-
3
16
﹚×﹙
2
9
+
1
3
﹚,
=
9
16
×
5
9

=
5
16


(4)
2
9
×0.375÷
6
7

=
1
12
÷
6
7

=
7
72


(5)12×﹙
1
4
+
1
6
-
1
3
﹚,
=12×
1
4
+12×
1
6
-12×
1
3

=3+2-4,
=5-4,
=1;

(6)
1
15
÷[﹙
2
3
+
1
5
﹚×
1
26
],
=
1
15
÷[
13
15
×
1
26
],
=
1
15
÷
1
30

=2.
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