==================资料简介======================
2.1.1不进位加 课件 :33张PPT课前复习
32+20= 16 +8 =
44+5 = 20+30=
31+10= 52+6 =
15+9 = 23+5 =
61+7 = 50+20=
32+20= 52 16 +8 =
44+5 = 20+30=
31+10= 52+6 =
15+9 = 23+5 =
61+7 = 50+20=
================================================
压缩包内容:
2.1.1不进位加 课件 .ppt