题目内容

怎样简便怎样算
(68-
17
18
)×
1
17
5
6
÷[
4
5
÷(1-
1
3
)]
4÷
4
5
-
4
5
÷4
5
3
-
2
7
-
5
7
.
(1)(68-
17
18
)×
1
17
,
=68×
1
17
-
17
18
×
1
17
,
=4-
1
18
,
=3
17
18
;

(2)
5
6
÷[
4
5
÷(1-
1
3
)],
=
5
6
÷[
4
5
÷
2
3
],
=
5
6
÷
6
5
,
=
25
36
;

(3)4÷
4
5
-
4
5
÷4,
=5-
1
5
,
=4
4
5
;

(4)
5
3
-
2
7
-
5
7
,
=
5
3
-(
2
7
+
5
7
),
=
5
3
-1,
=
2
3
;
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