Ответы и объяснения

2013-04-26T14:29:38+04:00

25х – х^3 = x(25-x^2) = x(5-x)(5+x)

 

2х^2 – 20х + 50 = 2(x^2-10x+25) = 2(x-5)^2 = 2(x-5)(x-5)