Réponses

2013-03-03T11:04:12+01:00
Il faut que x^2=100-x^2
2x^2=100
x^2=50
x=racine de 50=5racine de 2
2013-03-03T11:10:05+01:00
On cherche x tel que :(10-x)*(10-x)=x*x
100-10x-10x+x^2 = x^2
100-20x=0
100=20x
X=100/20
X=10/2