6ab=9a-10b+16=6ab-9a+10b-15-1=0
6ab-9a+10b-15=(3a+5)(2b-3)=1
所以3a+5=1,2b-3=1或3a+5=-1,2b-3=-1
3a+5=1不满足a为整数
所以3a+5=-1,2b-3=-1
a=-2,b=1
a+b=-1
6ab=9a-10b+16=6ab-9a+10b-15-1=0
6ab-9a+10b-15=(3a+5)(2b-3)=1
所以3a+5=1,2b-3=1或3a+5=-1,2b-3=-1
3a+5=1不满足a为整数
所以3a+5=-1,2b-3=-1
a=-2,b=1
a+b=-1