23的分解合成加减法课堂PPT

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授课：XX211授课：XX112授课：XX授课：XX1+1=2加号等于号授课：XX授课：XX减号等于号授课：XX213授课：XX213授课：XX213授课：XX213授课：XX授课：XX1+2=3授课：XX授课：XX+=授课：XX授课：XX授课：XX授课：XX授课：XX+=1 +1 =2-=2 -1 =1授课：XX1 +2 =3+=3 -1 =2-授课：XX2 +1=3+=-=3 -2 =1授课：XX1 +1 =2 +1 =23授课：XX3 -1 =3 -2 =21授课：XX3 -1 =2 +1 =23授课：XX31123填授课：XX212111111122313221211333231121223321122112133211233112授课：XX3 -=2 -1=22 +=32 +1=+1=33 -2=3 -=1 -2 =1 +1=21 +=22 -=12 -1 =-1 =11 +2=1 +=3 +2=33 -1=1 +1=211112321213312123授课：XX 盘子里一共有盘子里一共有3个苹果，小明拿走了个苹果，小明拿走了1个苹个苹果，还剩下几个苹果？果，还剩下几个苹果？授课：XX再见 授课：XXThank you!31