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20以内退位减法破十法、凑十法复习【重点知识】凑十法：进位加法使用凑十法口诀：看大数，分小数，凑成十，算得数.凑十法儿歌：小朋友来拍拍手，大家来唱凑十歌。一凑九，二凑八，三凑七来四凑六，五五相凑就满十。9 + 2 = 9 + 3 = 9 + 7 =8 + 5 = 8 + 8 = 8 + 7 =8 + 4 = 8 + 3 = 8 + 6 =9 + 4 = 9 + 8 = 9 + 5 =8 + 6 = 8 + 7 = 9 + 7 =7 + 4 = 7 + 6 = 7 + 5 =9 + 4 = 9 + 5 = 9 + 6 =8 + 6 = 8 + 7 = 8 + 8 =6 + 8 = 7 + 9 = 8 + 9 =5 + 8 = 7 + 8 = 4 + 9 =4 + 8 = 6 + 9 = 3 + 9 =3 + 8 = 5 + 9 = 8 + 8 =3
