Question

31+32+33+34+35的简便计算方法？

30＋31十32十33十34

Answer 1

31+34+33+32+35
65+65+35
100+65
165

Answer 2

31＋32＋33＋34＋35
＝33x5
＝165

Answer 3

31＋32＋33＋34＋35
＝33x5
＝165