998乘以1002怎样算

998乘以1002怎样算 9.8乘以65.2乘以1.25减12.5乘以0.625乘以18怎样简算 99乘以63怎样简便怎样算 48乘以0.69+3.1乘以4.8怎样简便算 48乘以0.69+3.1乘以4.8怎样简便算 12.5乘以0.25再乘以64怎样算简便 怎样巧算 3333乘以4444加3334乘以2222 怎样算11-4乘以3乘以6=? 81乘以710-71乘以810怎样巧算 998乘以1002-998乘以1001 999乘以111怎样巧算 23.7乘以9.9怎样简算? 36乘以21怎样算更简便 199乘以50/13怎样简算 98乘以53怎样简算 怎样简便怎样算 65乘以99加65 85乘以201减85怎样简便怎样算65乘以99加6585乘以201减85 括号91乘以63乘以84括号除以括号13乘以42乘以9括号等于多少,怎样算简便? [1-2分之一}乘以{1-3分之一}乘以{1-4分之一]乘以等等乘以{1-199分之一}怎样算