求28乘以38加56乘以81的简便计算方法?

求28乘以38加56乘以81的简便计算方法? 5.6乘以9加56乘以0.1简便计算 124乘以38加65乘以124加76乘以110减76乘以7简便计算 计算 能简便的要简便 56乘以0.375加45乘以百分之375减8分之一 47乘以69加52乘以69加69求给简便方法计算.. 512乘以81加11乘以875加637乘以19的简便算法 5.79乘以37加5.79乘以28加5.79乘以35的简便方法 99乘以38的简便计算 2.5乘以12.5乘以0.8乘以0.4的简便计算 5分之38乘以42加7.6加57乘以5分之38 简便计算 4.66乘以0.28加4.66乘以0.82减4.66求简便计算 99乘以68加68的简便计算 5.68乘以0.99加0.0568的简便计算 2.7乘以98加27乘以0.2 简便计算 0.21乘以6.4加0.42乘以1.8简便计算 36乘以111加888乘以8简便方法计算 简便计算:222乘以999加333乘以334 怎样简便计算18乘以45加24乘以55?