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第二届“华罗庚金杯”少年数学邀请赛二试决赛中最后1题为: 下面是两个1989位整数相乘那么N的各位数字之和是. 它的答案是17901.如果将1989改为任意
The final question of the second “Hua Luogeng Gold Cup” juvenile mathematics invitational finals is: The following is the sum of the two 1989-bit integers and the number of digits of N. The answer is 17901. If 1989 is changed to arbitrary