以内加减法口算练习题免费强烈推荐

63+ 3=29 - 7=33+ 2 =3+ 40=15 + 4=23+ 5=37+ 3 =29-3 =38 - 3=15-4=73+ 4 =30+ 8 =43 + 1 =48 - 30=11 + 2