9. (2023•盱眙县校级四模)已知a>b>1a>b>1a>b>1,给出下列不等式:①b+1a+1>ba\frac{b+1}{a+1}>\frac{b}{a}a+1b+1>ab;②a+1a>b+1ba+\frac{1}{a}>b+\frac{1}{b}a+a1>b+b1;③a3+b3>2a2ba^{3}+b^{3}>2a^{2}ba3+b3>2a2b;④a+1b>b+1aa+\frac{1}{b}>b+\frac{1}{a}a+b1>b+a1;其中正确的有((( )))