（a+1/a)²+(b+1/b)²=(a+1/a+b+1/b)²-2（a+1/a)(b+1/b）=(1+1/ab)²-2(ab+a/b+b/a+1/ab)=(1+1/ab)²-2[ab+(1+a²+b²)/ab]=(1+1/ab)²-2[ab+(2-2ab)ab]显然,随着ab值的增大,值会...