Решите уравнения: в) -2x^2 - 4x=0
г) x^3 - x^2=0

в)1-z^2=0
г)3z^2-75=0

в)5z^3 - 5z=0
г)z - 9z^3=0

в)5y^2 + 20y+20=0
г)2y^2 - 12y+18=0
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