x=y且xy≠0.求1910x^2+99y^2/2009xy

问题描述:

x=y且xy≠0.求1910x^2+99y^2/2009xy

如果是(1910x²+99y²)/2009xy 的话
(1910x²+99y²)/2009xy=2009xy/2009xy=1