0\\
x^2>49\\
|x|>7\\
OTBET:x\in(-\infty;-7)U(7;+\infty)" alt="1) \frac{(x-7)^2}{x^2-49} \geq 0\\
x^2-49 > 0\\
x^2>49\\
|x|>7\\
OTBET:x\in(-\infty;-7)U(7;+\infty)" align="absmiddle" class="latex-formula">
0\\
x^2>9\\
|x|>3\\
OTBET:x\in(-\infty;-3)U(3;+\infty)" alt="2)\frac{x^2}{x^2-9} \geq 0\\
x^2-9>0\\
x^2>9\\
|x|>3\\
OTBET:x\in(-\infty;-3)U(3;+\infty)" align="absmiddle" class="latex-formula">
0\\
x>-1\\
OTBET:x\in(-1;+\infty)" alt="3) \frac{(x+1)^2}{x+1} \geq 0\\
x+1>0\\
x>-1\\
OTBET:x\in(-1;+\infty)" align="absmiddle" class="latex-formula">