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3m²-4m-10>0
Δ1=16+120=136 √Δ1=2√34
m1=(4-2√34)/6=2/3+1/3√34
m2=2/3-1/3√34
m∈(-∞,m1)∨(m2,+∞)
1/x1+1/x2=(x1+x2)/(x1*x2)
g(m)=(-b/a)/(c/a)=-b/c=-4m/(m-2)