1/3(x2-50x) 如何化简为1/3(x-25)²+625/3

问题描述:

1/3(x2-50x) 如何化简为1/3(x-25)²+625/3

1/3(x^2-50x)
=1/3(x^2-2*25*x+25^2-25^2)
=1/3[(x-25)^2-625]
=1/3(x-25)^2-625/3