一道初三数学题目！救命啊！！！！！！！！！！

y = ( X-6.5 )^2+( X-5.9)^2+( X-6.0 )^2+( X-6.7)^2+( X-4.5 )^2 =(x^2-13x+42.25)+(x^2-11.8x+34.81)+(x^2-12x+36)+(x^2-13.4x+44.89)+(x^2-9x+20.25) =5x^2-59.2x+178.2