如题所述
p(x1,x2)=0.5457e^(-0.75x2^2-3.75x1^2-1.5x1) 当x1+x2>10.7575e^(-x2^2-6x1^2) 当-1<x1+x2≤10.5457e^(-0.75x2^2-3.75x1^2+1.5x1) 当x1+x2≤-1