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Решите уравнение(907-908) Плиз (907)

a)3x^2+15x=0

б)9y-y^2=0

в)-2x^2-4x=0

г)x^3-x^2=0

(908)

а)x^2-4=0

б)4x^2-25=0

в)1-z^2=0

г)3z^2-75=0

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