已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=?

已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=?
已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=?

已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=?
由x+3y+5z=0 x2+3y+z=0可以求出x,y,z之间的比值,用参数表示,然后再代入x.x+y.y-2z.2z/3x.3x+2y.2y+z.z就可以了.具体过程我就不写了.

x2是x的2次方还是2倍的x？