6.6乘以7.8加3.3乘以4.4,用简便方法计算

6.6乘以7.8加3.3乘以4.4,用简便方法计算 6.25乘以6.6加3.3乘以6又4分之1加1.1乘以625% 简算：4.4乘以57.8加45.3乘以5.6. 4.8乘以7.8加78乘以0.5用减便计算 7.8乘以4.2加2.2乘以4.2等于(7.8+2.2)乘以4.2这是根据( )简算 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 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 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 52乘以76加47乘以76加76 1200乘以5加1800乘以15加2500乘以4加3000乘以2加5000除以27等于? 999乘以99加99 99乘以38加38. 1999乘以99加1999