5)As equações do 2º grau x² + 6x + 9 = 0, 4x² - 25 = 0, 2x² = 0, 2x² - 5x + 2 = 0 e-21x² + 7x=0 são classificadas, nessa ordem, em: a)completa, incompleta, incompleta, completa e incompleta. b)completa, completa, incompleta, incompleta e incompleta. c)completa, incompleta, completa, incompleta e completa. d)completa, completa, completa, completa e completa. e)incompleta, incompleta, incompleta, incompleta e incompleta.​
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