indique os coeficientes das equaçoes do 2 grau a) -x elevado a 2 - x - 0=0 b) x elevado a 2 = 7x c) -3x elevado a 2 - 0 x + 4=0 d) 5por 4 x elevado a 2 - x =0 e) -2,4x elevado a 2 + 0,2x - 8=0 f) 0x elevado a 2 -5x +2=0
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