---Can you come to my party this Wednesday? ---______. I have to study for my math test. A.Sorry, I can’t B.Yes, I can C.Sure, I’d love to D.No, I can’t 答案:A已知f(x)=log12x,当点M(x,y)在y=f(x)的图象上运动时,点N(x-2,ny)在函数y=gn(x)的图象上运动(n∈N*).(1)求y=gn(x)的表达式;(2)若方程g1(x)=g2(x-2+a)有实根,求实数a的取值范围;(3)设Hn(x)=2gn(x),函数F(x)=H1(x)+g1(x)(0<a≤x≤b)的值域为[log252b+2,log242a+2],求实数a,b的值.