题目内容
用简便方法计算
511×
2002×
2003×2003-2002×2004
7.24×
+0.6×2.41-0.65×60%
511×
| 373737 |
| 737373 |
2002×
| 2000 |
| 2001 |
2003×2003-2002×2004
7.24×
| 3 |
| 5 |
511×
,
=73×7×
,
=259;
2002×
,
=(2001+1)×
,
=2000
;
2003×2003-2002×2004,
=2003×2003-(2003-1)×(2003+1),
=2003×2003-(2003×2003-1),
=2003×2003-2003×2003+1,
=1;
7.24×
+0.6×2.41-0.65×60%,
=7.24×
+
×2.41-0.65×
,
=9×
,
=
.
| 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 |
=7.24×
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
=9×
| 3 |
| 5 |
=
| 27 |
| 5 |
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