Question

решите плиз матан, коренные уравнения

Answer 1

$1) \: ( \sqrt[3]{ - x} ) {}^{3} = {3}^{3 } \\ - x = {3}^{3} \\ - x = 27 \\ x = - 27$
$3) \: x \sqrt{x {}^{2} - 5x + 4 } - 3 \sqrt{x {}^{2} - 5x + 4 } \\ \sqrt{x {}^{2} - 5x + 4} \times (x - 3) = 2x - 6 \\ \sqrt{x {}^{2} - 5x + 4 } = 2 \\ ( \sqrt{x {}^{2} - 5x + 4 } ) {}^{2} = 2 {}^{2} \\ x {}^{2} - 5x + 4 = 4 \\ x {}^{2} - 5x + 4 - 4 = 0 \\ x {}^{2} - 5x = 0 \\ x \times (x - 5) = 0 \\ x = 0 \: \: \: \: \: \: \: \: \: \: x - 5 = 0 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x = 5.$