分类：教育/科学-学习帮助
问题：觉得答案不对已知x&lt;5/4,求函数y=4x
已知x<5/4,求y=4x-2+1/(4x-5)的最大值
回答：x<5/4==>4x-5<0==>5-4x>0==>(5-4x)+1/(5-4x)≥2==>-[(5-4x)+1/(5-4x)]≤-2
y=4x-2+1/(4x-5)=(4x-5)+1/(4x-5)+3
=-[(5-4x)+1/(5-4x)]+3
≤1