题目内容

怎样简便就怎样算.
(1)[3.2×(1-
5
8
)+
3
5
1
12

(2)45÷[72×(
3
4
-
1
3
)
]
(3)
1
3
÷[(
2
3
+
1
5
1
13
]

(4)4:
4
5
-
4
5
:4-4
4
5
(1)[3.2×(1-
5
8
)+
3
5
1
12

=[3.2×
3
8
+
3
5
1
12

=[1.2+
3
5
1
12

=1.8×
1
12

=
3
20


(2)45÷[72×(
3
4
-
1
3
)
],
=45÷[72×
3
4
-72×
1
3
],
=45÷[54-24],
=45÷30,
=1.5;

(3)
1
3
÷[(
2
3
+
1
5
1
13
]

=
1
3
÷[
13
15
×
1
13
],
=
1
3
÷
1
15

=5;

(4)4:
4
5
-
4
5
:4-4
4
5

=4÷
4
5
-
4
5
÷4-4
4
5

=5-
1
5
-4
4
5

=5-(
1
5
+4
4
5
),
=5-5,
=0.
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