Răspunsuri

Cel mai inteligent răspuns!
2014-11-02T20:04:43+02:00
A)x=V3-V5+V3+V5
x^2=(V3-V5)^2+2(V3-V5)(V3+V5)+(V3+V5)^2
=3-V5+3+V5+2V3^2-5=6+2V4=6+2*2=6+4=10
aplici formula Va-b*Va+b= V(a-b)(a+b)=Va^2-b^2

b) daca x^2=10 ⇒ x=V10
(V10-V10-1)^2007= (-1)^2007= - 1

1 5 1