2021年20以内的加减法练习题库20加减法试题直接打印

20以内加减法练习一8 + 4 = 15 - 7 = 14 - 8 = 5 + 7 =14 - 6 = 12 - 5 = 5 + 8 = 13 - 4 =5 + 9 = 7 + 4 = 13 - 6