Resolva estas equaçoes de 2 grau em que x representa um numero real: a) 9t-18t²=0
b) -6x²+54=0
c) 3x²-36=0
d)18x² -2=0
b) -6x²+54=0
c) 3x²-36=0
d)18x² -2=0
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