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0.2x^2-20x+500=0
a = 0.2; b = -20; c = +500;
Δ = b2-4ac
Δ = -202-4·0.2·500
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{20}{0.4}=50$
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