题目内容

计算,能简算的要简算
1
3
÷
4
9
+
1
3
+
1
4
  
2
5
×
18
5
+
3
5
×
18
5

[1-(
1
2
-
1
3
)]×
1
5
  
(
1
69
+
2
71
)×23+
25
71
.
(1)
1
3
÷
4
9
+
1
3
+
1
4
,
=
3
4
+
1
3
+
1
4
,
=
3
4
+
1
4
+
1
3
,
=1+
1
3
,
=1
1
3
;

(2)
2
5
×
18
5
+
3
5
×
18
5
,
=(
2
5
+
3
5
)×
18
5
,
=1×
18
5
,
=
18
5
;

(3)[1-(
1
2
-
1
3
)]×
1
5
,
=[1-
1
6
]×
1
5
,
=
5
6
×
1
5
,
=
1
6
;

(4)(
1
69
+
2
71
)×23+
25
71
,
=
1
69
×23+
2
71
×23+
25
71
,
=
1
3
+
46
71
+
25
71
,
=
1
3
+(
46
71
+
25
71
),
=
1
3
+1,
=1
1
3
.
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