一年级数学个位数加减法口算练习题大全(连加法,连减法,连加减法直接打印版)

8 + 2 + 7 = 6 + 2 + 2 = 3 + 5 + 1 = 6 + 4 + 1 = 7 + 9 + 3 = 4 + 4 + 6 = 5 + 4 + 4 = 8 + 5 +