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x^2+y^2=5/4 cum se rezolva?

Răspuns :

x²+y²=5/4
5/4=1/4+4/4=1/4 + 1 = (1/2)² +1²
x²+y² = (1/2)² +1² 
x²= 1/4⇒ x∈ {-1/2;+1/2}
y²=1⇒ y∈{1,-1}
sau 
y²= 1/4⇒ y∈ {-1/2;+1/2}
x²=1⇒ x∈{1,-1}