10道简便计算四年级
例1、5.76＋13.67＋4.24＋6.33 =（5.76＋4.24）＋(13.67＋6.33) =10＋20 =30 例2、37.24＋23.79－17.24 =37.24－17.24＋23.79 =20＋23.79 =43.79 例3、 4×3.78×0.25 =4×0.25×3.78 =1×3.78 =3.78 例4、 125×246×0.8 =125×0.8×246 =100×246 =24600 例5、(2.5＋12.5)×40 =2.5×40＋12.5×40 =100＋500...