Escreva no caderno as equações que são do 2° grau com uma incógnita:
A) 3x²-5x+1=0 B)10 x^{4} -3x²+1=0 C)2x-3=0 D)-x²-3x+2=0 E)4x²-x=0 F)9x²-1=0
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