Verified answer

(3X1^2X2+3X1X2^2)/2X1X2=3X1X2(X1+X2)/2X1X2=3(X1+X2)/2

3X^2+11X+7=0

X1+X2=-11/3

3(X1+X2)/2=-11*3/(3*2)=-11/2=-5,5

Да легко)

(3x₁²x₂+3x₁x₂²)/2x₁x₂=3x₁x₂(x₁+x₂)/2x₁x₂=1,5(x₁+x₂);

По теореме Виета х₁+х₂=-b/a=-11/3;

(3/2)*(-11/3)=-11/2=-5,5.

Ответ: -5,5.