(1)n*(n+1)*(n+2)*(n+3)+1=(6n-1)*(6n-1)
证明:n*(n+1)*(n+2)*(n+3)+1
=[n*(n+3)][(n+2)*(n+1)]+1
=(n²+3n)(n²+3n+2)+1
=(n²+3n)²+2(n²+3n)+1
=……=(6n-1)²
(2)...
(1)n*(n+1)*(n+2)*(n+3)+1=(6n-1)*(6n-1)
证明:n*(n+1)*(n+2)*(n+3)+1
=[n*(n+3)][(n+2)*(n+1)]+1
=(n²+3n)(n²+3n+2)+1
=(n²+3n)²+2(n²+3n)+1
=……=(6n-1)²
(2)...