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x+y=6,xy=4,x patrat+y patrat=? cum se rezolva

Răspuns :

xy=4
x+y=6
(x+y)^2=6^2
(x+y)(x+y)=36
x^2+2xy+y^2=36
x^2+2*4+y^2=36
x^2+8+y^2=36
x^2+y^2=36-8
x^2+y^2=28