开火车，算一算
3 + 4 = 5 + 5 = 7 + 3 = 7 – 2 = 5 + 4 = 6 + 3 = 4 + 4 = 3 + 7 = 8 – 6 = 6 + 4 = 8 – 5 = 10 – 5 = 5 + 5 = 10 – 6 = 8 + 2 = 7 + 2 = 5 + 3 = 10 – 3 = 10 – 1 = 2 + 7 =
10
