Question

y=100x/(x+5)²怎样化成二次函数形式?

Answer 1

y=100x/(x+5)^2

=[100(x+5)-500]/(x+5)^2

=[100/(x+5)]-[500/(x+5)^2]--①

这样,以1/(x+5)=t,则

y=100t-500t^2

是二次函数,

①式是二次函数形式