Question

решите уравнение только 7

Answer 1

$4x {}^{ - 2} + 4x {}^{ - 1} + 1 = 0 \ 4 times frac{1}{x {}^{2} } + 4 times frac{1}{x} + 1 = 0 \ frac{4}{x {}^{2} } + frac{4}{x} + 1 = 0 \ ( frac{2}{x} + 1) {}^{2} = 0 \ ( frac{2 + x}{x} ) {}^{2} = 0 \ frac{2 + x}{x} = 0 \ 2 + x = 0 \ x = - 2 \ \ 9x {}^{ - 2} - 12x {}^{ - 1} + 4 = 0 \ 9 times frac{1}{x {}^{2} } - 12 times frac{1}{x} + 4 = 0 \ frac{9}{x {}^{2} } - frac{12}{x} + 4 = 0 \ ( frac{3}{x} - 2) {}^{2} = 0 \ ( frac{3 - 2x}{x} ) {}^{2} = 0 \ frac{3 - 2x}{x} = 0 \ 3 - 2x = 0 \ - 2x = - 3 \ x = frac{3}{2} \ x = 1 frac{1}{2}$