Let a,b,c,d,l,m,n be fixed positive integers satisfying d+dbm=cn,gcd(a,db) = 1 ,l>1 ,m >1 and n>1. It was prove that if a(?)

• 设a,b,c,d,l,m,n是给定的适合d+ab~m=c~n,gcd(a,ab)=1,l>1,m>1,n>1,的正整数。