问题 解答题
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%
答案

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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