Question

已知Y=y1+y2,y1与x成反比例,y2与x^2成正比例,且当x=-1时y=-5,当x=1时,Y=1,求y和x之间的函

Answer 1

设y1x=k,y2=tx^2

Y=k/x+tx^2

当x=-1时y=-5,当x=1时,Y=1,

-5=-k+t

1=k+t

k=3,t=-2

y=3/x-2x^2