Réponses

2013-09-29T21:41:30+02:00
25x^2-40x+16= 0 \\ (5x-4)^2 = 0 \\ x =  \frac{4}{5} \\

(x-5)^2-(x-3)^2= 0 \\ (x-5 -x +3)(x-5+x-3)=0 \\ -2(2x-8) = 0 \\ -4(x-4) = 0 \\ x = 4

En espérant t'avoir aidé.