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45y^2-150y+125=0
a = 45; b = -150; c = +125;
Δ = b2-4ac
Δ = -1502-4·45·125
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$y=\frac{-b}{2a}=\frac{150}{90}=1+2/3$
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