2,3 примеры неверно !
0,\; \; \frac{x^2-4}{x-1}<0,\; \; \frac{(x-2)(x+2)}{x-1}<0\\\\+++(2)---(1)+++(-2)---\\\\x\in (-\infty,-2)U(1,2)\\\\\\3)\; \; \frac{9-x^2}{x-2}>0,\; \frac{x^2-9}{x-2}<0,\; \frac{(x-3)(x+3)}{x-2}<0\\\\----(-3)+++(2)---3)+++\\\\x\in (-\infty,-3)U(2,3)" alt="2)\; \; \frac{4-x^2}{x-1}>0,\; \; \frac{x^2-4}{x-1}<0,\; \; \frac{(x-2)(x+2)}{x-1}<0\\\\+++(2)---(1)+++(-2)---\\\\x\in (-\infty,-2)U(1,2)\\\\\\3)\; \; \frac{9-x^2}{x-2}>0,\; \frac{x^2-9}{x-2}<0,\; \frac{(x-3)(x+3)}{x-2}<0\\\\----(-3)+++(2)---3)+++\\\\x\in (-\infty,-3)U(2,3)" align="absmiddle" class="latex-formula">