令x-1=s,y+2=t,即x=1+s ,y=t-2,代入得f(x,y)=4(1+s)^2+(1+s)(t-2)-(t-2)^2-6(1+s)-3(t-2)+5打开化简得=4s^2-t^2+st+2t+3=3+2t+4s^2+st-t^2。f(x,y)=e^xln(1+y)=(1+x+x^2/2+x^3/3+....)(y-y^2/2+y^3/3+....)=y+xy-y^2/2+x^2y/2-xy^2/2+y^3/3+小o((x^2+y^2)^(3/2))
我猜你是北科的、。、、