30以内加减法练习(12页-每页100题-A4纸)
30以内加减法练习(一)18- 15 = 27-11 = 13+1 6 = 27- 5 =26-10 = 25 - 4 = 39 -
30以内加减法练习(12页-每页100题-A4纸)