设P(x,y)则√(x³+y²)=|x+4y-2|/√(1²+4²)平方x²+y²=(x²+16y²+4+8xy-4x-16y)/1717x²+17y²=x²+16y²+4+8xy-4x-16y16x²-8xy+y²+4x+16y-4=0...