Nếu a>b =>b(a+1)<a(b+1)=>a/b > a+1/b+1
Nếu a=b =>b(a+1)=a(b+1)=>a/b = a+1/b+1
Nếu a<b => b(a+1)>a(b+1) =>a/b < a+1/b+1
nếu a>b thì ab+a>ba+b=> a(b+1)>b(a+1) hay a/b>a+1/b+1
___a<b thì ____<____________<____________<_______
___a=b thì ____=____________=____________=_______