四年级下册数学 【期末复习:小数加减法简便运算】

四年级下册数学 【期末复习: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 37.34-5.55-4.45 =37.34-(5.55+4.45) =37.34-10 =27.34 3.64+12.75+5.36-7.25 =3.64+5.36+(12.75-7.25) =9+5.5 =14.5 9.6+20.03-11.03 =9.6+(20.03-11.03) =9.6+9 =18.6 12.01+7.12-8.01 =12.01-8.01+7.12 =4+7.12 =11.12 12.99+10.48-4.99 =12.99-4.99+10.48 =8+10.48 =18.48