2.25乘以1.8加12.5乘以0.18 简算?

2.25乘以1.8加12.5乘以0.18 简算? 五年级 0.15乘以0.8乘以12.5加8乘以3乘以0.125怎么简便算 0.21乘以6.4加0.42乘以1.8简便计算 加10%是乘以1 40%乘以1.4 50%乘以1.4 60%乘以1.4 70%乘以1.7 80%乘以1.8 90% 1.9 那100%的管理费又如何算加10%是乘以1 40%乘以1.4 50%乘以1.4 60%乘以1.4 70%乘以1.7 80%乘以1.8 90% 1.9 那100%的管理费又如何算呢?15% 9.99乘以22.2加33.3乘以3.34 9.99乘以22.2加33.3乘以3.34 9999乘以7加1111乘以37 26乘以187加169乘以2 111111乘以999999加999999乘以555555 2.5乘以3.2乘以12.5 198乘以0.51用简便计算怎样做还有40.7-2.6乘以9.3、5.2乘以10.1还有3.2乘以1.8+2.54、0.8乘以72.4乘以12.5、2.5乘以3.7+6.3乘以2.5 一乘以二乘以三分之一加2乘以3乘以4分之一+3乘以4乘以5分之1+……+48乘以49乘以50分之1. 2000乘以1999减1999乘以1998加1998乘以1997减1997乘以1996,简算 12.5乘以79加12.5乘以2减12.5简算怎么算 5.3乘以99加5.3,12.5乘以35乘以25,13乘以2.5乘以0.8加3.6,19分之5减17分之4加19分之14减17分之13要用简便方法 怎样简便计算8.1乘以2.31加8.1乘以3.87除以1.8 怎样简便计算8.1乘以2.31加8.1乘以3.87除以1.8急 52乘以76加47乘以76加76