题目内容

脱式计算.
(1)8.25-2.43-3.57
(2)3.6÷(7.2-4×1.5)
(3)
2
9
+
5
12
×
4
5

(4)
3
8
÷[
3
5
×(
3
4
-
1
4
)]

(1)8.25-2.43-3.57,
=8.25-(2.43+3.57),
=8.25-6,
=2.25;

(2)3.6÷(7.2-4×1.5),
=3.6÷(7.2-6),
=3.6÷1.2,
=3;

(3)
2
9
+
5
12
×
4
5

=
2
9
+
1
3

=
5
9


(4)
3
8
÷[
3
5
×(
3
4
-
1
4
)]

=
3
8
÷[
3
5
×
1
2
],
=
3
8
÷
3
10

=
5
4
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