四年级数学下册小数加减法简便运算

四年级数学下册小数加减法简便运算


简介:
18.73+4.36-8.73+5.64 =(18.73-8.73)+(4.36+5.64) =10+10 =20 8.96-(4.96+0.72) =8.96-4.96-0.72 =4-0.72 =3.28 12.34-(2.34-1.99) =12.34-2.34+1.99 =10+1.99 =11.99