我来了~哈哈!把方程乘以4倍就等于20X＾2-12xy+2y^2-8x+2y+1=0.分成4x^2-4xy+y^2+16x^2-8xy+y^2-8x+2y+1=0 变成(2x-y)^2+(4x-y)^2-2(4x-y)+1=0 (2x-y)^2+(4x-y-1)^2=0 因为2个平方都大于等于0,所以2个都等于0 所以1.2...