1) 10x + 5x = 0. 2) 12x² + 3x = 0. 3) x² - 10x = 0. 4) x² + 6x = 0. 5) -4x² + 20x = 0. 6) 3x² - 12x = 0. 7) -2x² + x = 0. 8) 4x² - x = 0. 9) 3x² - 27x = 0. 10) x² + 3 = 3 - x. 11) -x² + 2 = x + 2. 12) 5x + 2 = 2 - 2x². 13) 2x² + 3 = 3 - 7x.

Давай решим эти уравнения по порядку! 1) 10x + 5x = 0 15x = 0 x = 0 2) 12x² + 3x = 0 3x(4x + 1) = 0 3x = 0 или 4x + 1 = 0 x = 0 или x = -1/4 3) x² - 10x = 0 x(x - 10) = 0 x = 0 или x - 10 = 0 x = 0 или x = 10 4) x² + 6x = 0 x(x + 6) = 0 x = 0 или x + 6 = 0 x = 0 или x = -6 5) -4x² + 20x = 0 -4x(x - 5) = 0 -4x = 0 или x - 5 = 0 x = 0 или x = 5 6) 3x² - 12x = 0 3x(x - 4) = 0 3x = 0 или x - 4 = 0 x = 0 или x = 4 7) -2x² + x = 0 x(-2x + 1) = 0 x = 0 или -2x + 1 = 0 x = 0 или x = 1/2 8) 4x² - x = 0 x(4x - 1) = 0 x = 0 или 4x - 1 = 0 x = 0 или x = 1/4 9) 3x² - 27x = 0 3x(x - 9) = 0 3x = 0 или x - 9 = 0 x = 0 или x = 9 10) x² + 3 = 3 - x x² + x = 0 x(x + 1) = 0 x = 0 или x + 1 = 0 x = 0 или x = -1 11) -x² + 2 = x + 2 -x² - x = 0 -x(x + 1) = 0 -x = 0 или x + 1 = 0 x = 0 или x = -1 12) 5x + 2 = 2 - 2x² 2x² + 5x = 0 x(2x + 5) = 0 x = 0 или 2x + 5 = 0 x = 0 или x = -5/2 13) 2x² + 3 = 3 - 7x 2x² + 7x = 0 x(2x + 7) = 0 x = 0 или 2x + 7 = 0 x = 0 или x = -7/2

Ответ: Решения уравнений выше.