Resolva as seguintes equações do 2º grau, identifique os coeficientes e determine as raízes se existir; a) 6x²+x-1=0
b)3x²-7x+2=0
c)2x²-7x=15
d) 4x²+9=12x
b)3x²-7x+2=0
c)2x²-7x=15
d) 4x²+9=12x
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