问题 解答题
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
答案

(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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