问题 解答题
怎样简便怎样算.
5
6
×
7
25
×6
2
5
×
3
14
×
2
3
3
7
+
1
2
)×14
5
8
×
5
8
+
5
8
×
3
8
100×
2
99
5
14
×
7
25
×
5
8
×
2
3
答案

(1)

5
6
×
7
25
×6,

=

5
6
×6×
7
25

=5×

7
25

=

7
5

(2)

2
5
×
3
14
×
2
3

=

2
5
×(
3
14
×
2
3
),

=

2
5
×
1
7

=

2
35

(3)(

3
7
+
1
2
)×14,

=

3
7
×14+
1
2
×14,

=6+7,

=13;

(4)

5
8
×
5
8
+
5
8
×
3
8

=

5
8
×(
5
8
+
3
8
),

=

5
8
×1,

=

5
8

(5)100×

2
99

=(99+1)×

2
99

=99×

2
99
+1×
2
99

=2+

2
99

=2

2
99

(6)

5
14
×
7
25
×
5
8
×
2
3

=(

5
14
×
7
25
)×(
5
8
×
2
3
),

=

1
10
×
5
12

=

1
24

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