四年级下册数学 小数加减法的简便计算

四年级下册数学 小数加减法的简便计算


简介:
(1)4.12-1.78-1.22 =4.12-(1.78+1.22) =4.12-3 =1.12 (2)52-17.87-12.23 =52-(17.87+12.23) =52-30.1 =21.9 (3)57+3.17+3.43+5.83 =(57+3.43)+(3.17+5.83) =60.43+9 =69.43 (4)75-8.64-3.36 =75-(8.64+3.36) =75-12 =63