题目内容

神机妙算(写出简算过程)
2005×
2003
2004

(3-
1
5
+
2
7
)×5×7
999
8
9
+99
8
9
+9
8
9
+
1
3
(1)2005×
2003
2004

=(2004+1)×
2003
2004

=2004×
2003
2004
+
2003
2004
×
1,
=2003+
2003
2004

=2003
2003
2004


(2)(3-
1
5
+
2
7
)×5×7,
=(3-
1
5
+
2
7
)×35,
=35×3-35×
1
5
+35×
2
7

=105-7+10,
=98+10,
=108;

(3)999
8
9
+99
8
9
+9
8
9
+
1
3

=999
8
9
+99
8
9
+9
8
9
+
3
9

=(999
8
9
+
1
9
)+(99
8
9
+
1
9
)+(9
8
9
+
1
9
),
=1000+100+10,
=1110.
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