" b="" -4ac="" <mfrac>="" -b±="" <msqrt>="" msqrt>="" 2a="" mfrac>="" -8="0" +8="0" +bx+c="0" esempio="" Δɬ="" 8="" +10x-3="0" 1="" ≠="" -b-="" -="" c="" spurie="" x(ax+b)="0," ax="-b" -12x+9="0" ∈c, ="" ∈c="" -b+i="" math>"="">
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