设这四个连续整数依次为:n-1,n,n+1,n+2,则(n-1)n(n+1)(n+2)+1,=[(n-1)(n+2)][n(n+1)]+1 =(n 2 +n-2)(n 2 +n)+1=(n 2 +n) 2 -2(n 2 +n)+1=(n 2 +n-1) 2 .故四个连续整数的积加上1是...