计算巧算(四年级奥数题及答案)(2)
本站原创
2011-05-19 16:45:27
解:186576×199911-199912×186575
=(186575+1)×199911-(199911+1)×186575
=186575×199911+1×199911-199911×186575-1×186575
=199911-186575
=13336
