问题 解答题
怎样简便就怎样算:
5
12
×
1
4
×24
42×(
5
6
-
4
7
2
3
+
1
2
)×
6
7
3
5
×
14
9
-
4
9
×
3
5
答案

(1)

5
12
×
1
4
×24,

=

5
12
×(
1
4
×24),

=

5
12
×6,

=

5
2

(2)42×(

5
6
-
4
7
),

=42×

5
6
-42×
4
7

=35-24,

=11;

(3)(

2
3
+
1
2
)×
6
7

=

2
3
×
6
7
+
1
2
×
6
7

=

4
7
+
3
7

=1;

(4)

3
5
×
14
9
-
4
9
×
3
5

=

3
5
×(
14
9
-
4
9
),

=

3
5
×
10
9

=

2
3

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