>>35
浪人生？
p(x)=q(x)(x+1)^2(x-2)+ax^2+bx+c
=q(x)(x+1)^2(x-2)+a(x+1)^2
=q(x)(x+1)^2(x-2)+r(x)(x-2)+1
p(2)=9a=1

∴a=1/9