问题
填空题
20.09×355
|
答案
20.09×355
-2009×2 5
+99.1×549 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．