题目内容
20.09×355
-2009×
+99.1×
=______．
| 2 |
| 5 |
| 549 |
| 1000 |
| 1 |
| 20 |
20.09×355
-2009×
+99.1×
=20.09×355.4-20.09×54.9+99.1×0.05
=20.09×（355.4-54.9）+（100-0.9）×0.05
=20.09×300.5+5-0.045
=20.09×（300+0.5）+4.955
=6027+10.045+4.955
=6027+（10.045+4.955）
=6027+15
=6042．
故答案为：6042．
| 2 |
| 5 |
| 549 |
| 1000 |
| 1 |
| 20 |
=20.09×355.4-20.09×54.9+99.1×0.05
=20.09×（355.4-54.9）+（100-0.9）×0.05
=20.09×300.5+5-0.045
=20.09×（300+0.5）+4.955
=6027+10.045+4.955
=6027+（10.045+4.955）
=6027+15
=6042．
故答案为：6042．
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