(20 балов) (нужны разъяснения) укажите неполные квадратные уравнения:
1) [tex] x^{2} +2 = 0[/tex]
2)[tex](x+5)^{2} = 0 [/tex]
3)[tex]2 x^{2} -1 = 4x[/tex]
4)[tex]4 x^{2} -16x = 0[/tex]
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