ОГЭ по математике. №9 Квадратные уравнения. ФИПИ. Задача 3

ОТВЕТ: 0.

\(4{x^2} = 20x\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,4{x^2}-20x = 0\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,x\left( {4x-20} \right) = 0\,\,\,\,\,\, \Leftrightarrow \)

\( \Leftrightarrow \,\,\,\,\,\,\left[ \begin{array}{l}x = 0,\\4x-20 = 0\end{array} \right.\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,\left[ \begin{array}{l}x = 0,\\4x = 20\end{array} \right.\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,\left[ \begin{array}{l}x = 0,\\x = 5.\end{array} \right.\)

Меньший корень уравнения \(x = 0.\)

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