证明:
5^2*3^2n+1-2^2*3^2n+2
=5^2*3^2n+1-2^2*3*3^2n+1
=(5^2-2^2*3)*3^2n+1
=(25-4*3)*3^2n+1
=(25-12)*3^2n+1
=13*3^2n+1
所以5^2*3^2n+1-2^2*3^2n+2是13的倍数
不懂在HI上问我
证明:
5^2*3^2n+1-2^2*3^2n+2
=5^2*3^2n+1-2^2*3*3^2n+1
=(5^2-2^2*3)*3^2n+1
=(25-4*3)*3^2n+1
=(25-12)*3^2n+1
=13*3^2n+1
所以5^2*3^2n+1-2^2*3^2n+2是13的倍数
不懂在HI上问我