Resolvo as equações do 2º grau: a) x² + 5x-6 = 0
b) 9x²+8x-1=0
c) x²-49=0
d) 1 a²-16=0
4
b) 9x²+8x-1=0
c) x²-49=0
d) 1 a²-16=0
4
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