Задача 5. Решите уравнение    \(\left( {x-2} \right)\left( {x-3} \right)\left( {x-4} \right) = \left( {x-2} \right)\left( {x-3} \right)\left( {x-5} \right)\)

Ответ

ОТВЕТ: 2;   3.

Решение

\(\left( {x-2} \right)\left( {x-3} \right)\left( {x-4} \right) = \left( {x-2} \right)\left( {x-3} \right)\left( {x-5} \right)\,\,\,\,\,\,\, \Leftrightarrow \)

\( \Leftrightarrow \,\,\,\,\,\,\,\left( {x-2} \right)\left( {x-3} \right)\left( {x-4} \right)-\left( {x-2} \right)\left( {x-3} \right)\left( {x-5} \right) = 0\,\,\,\,\,\,\, \Leftrightarrow \)

\( \Leftrightarrow \,\,\,\,\,\,\,\left( {x-2} \right)\left( {x-3} \right)\left( {\left( {x-4} \right)-\left( {x-5} \right)} \right) = 0\,\,\,\,\,\,\, \Leftrightarrow \)

\( \Leftrightarrow \,\,\,\,\,\,\,\left( {x-2} \right)\left( {x-3} \right)\left( {x-4-x + 5} \right) = 0\,\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,\,\left( {x-2} \right)\left( {x-3} \right) = 0\,\,\,\,\,\,\, \Leftrightarrow \)

\( \Leftrightarrow \,\,\,\,\,\,\,\left[ {\begin{array}{*{20}{c}}{x-2 = 0,}\\{x-3 = 0\,}\end{array}} \right.\,\,\,\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,\,\,\,\left[ {\begin{array}{*{20}{c}}{x = 2,}\\{x = 3.}\end{array}} \right.\)

Ответ:  2; 3.