1. Hanth obnactb onpeneneHus pyHkunn y=(sqrt (2x-8))/(sqrt (x^2)-7x+12)-(sqrt (24-3x))/(x) 2. Haugute o6nactb onpeneneHus x a) (-6)/(sqrt (18+7x-x^2)) 6) y=6sqrt (18+7x-x^2) 3. Peunte HepaBeHCTBO (4x-7)^2geqslant (7x-4)^2

1. Домножим числитель и знаменатель первой дроби на $\sqrt{x^2-7x+12}$, а числитель и знаменатель второй дроби на $\sqrt{2x-8}$:<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}\cdot\sqrt{2x-8}}{x\cdot\sqrt{2x-8}}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}\cdot\sqrt{2x-8}}{x\cdot\sqrt{2x-8}}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}{x^2-7x+12}-\frac{\sqrt{24-3x}}{x}$<br />$y=\frac{\sqrt{2x-8}\cdot\sqrt{x^2-7x+12}}