怎么证明不等式成立怎么证明不等式成立
怎么证明不等式成立通分左边=(x1(x2^2+1)-x2(x1^2+1))/(x1^2+1)(x2^2+1)=[x1x2(x2-x1)-(x2-x1)]/(x1^2+1)(x2^2+1)=(x1x2-1)x1x2/(x1^2+1)(x2^2+1)(x1x2-1)0(x1^2+1)(x2^2+1)>0所以左边