Matematica per le superiori/La retta: differenze tra le versioni
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<math>s: y = \frac{b}{a}x</math><br>
<math>\left\{\begin{matrix} y = \frac{b}{a}x \\ ax + by + c = 0 \end{matrix}\right.</math> <math>\left\{\begin{matrix} - \\ ax + \frac{b^2}{a}x + c = 0 \end{matrix}\right.</math> <math>\left\{\begin{matrix} - \\ \frac{a^2x +bx +ac}{a} = 0 \end{matrix}\right.</math> <math>\left\{\begin{matrix} - \\ x(a^2 + b^2) = -ac \end{matrix}\right.</math> <math>\left\{\begin{matrix} - \\ x = -\frac{ac}{a^2 + b^2} \end{matrix}\right.</math> <math>\left\{\begin{matrix} y = \frac{b}{a}\frac{-ac}{a^2 + b^2} \\ x = -\frac{ac}{a^2 + b^2} \end{matrix}\right.</math><br>
<math>\overline{OH} = \sqrt{ \frac{a^
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