题目内容

用简便方法计算
511×
373737
737373

2002×
2000
2001

2003×2003-2002×2004
7.24×
3
5
+0.6×2.41-0.65×60%
511×
373737
737373


=73×7×
10101×37
10101×73

=259;

2002×
2000
2001

=(2001+1)×
2000
2001

=2000
2000
2001


2003×2003-2002×2004,
=2003×2003-(2003-1)×(2003+1),
=2003×2003-(2003×2003-1),
=2003×2003-2003×2003+1,
=1;

7.24×
3
5
+0.6×2.41-0.65×60%,
=7.24×
3
5
+
3
5
×2.41-0.65×
3
5

=9×
3
5

=
27
5
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