0 0 类别 : 课件

9 + 5 = 8 + 5 = 9 + 4 = 8 + 4 = 9 + 3 = 8 + 3 = 14 13 13 12 12 11 9 + 2 = 7 + 5 =11 12 设计制作：李杰 怎样想能很快说出得数？ 1 5 + 6 = □ 5 + 8 = □ 因为 6 + 5 = 11 所以 5 + 6 = 11 因为 8 + 5 = 13 所以 5 + 8 = 13 11 13 2 4 + 7 = □ 3 + 9 = □ 因为 7 + 4 = 11 所以 4 + 7 = 11 因为 9 + 3 = 12 所以 3 + 9 = 12 11 12 1. = = 2. 7 + 5 = 9 + 5 = 8 + 4 = 5 + 7 = 5 + 9 = 4 + 8 = 3. 9 + 4 = 8 + 3 = 9 + 2 = 4 + 9 = 3 + 8 = 2 + 9 = 5 + 8 13 3 + 9 12 12 14 12 12 14 12 13 13 11 11 11 11 做一做