1) 4(x-3)>2x+6
4x-12>2x+6
4x-2x > 6+12
2x > 18
2x:2 > 18:2
x > 9
Ответ: x∈]9; +∞)
2) 2" alt="\frac{x-5}{4}-\frac{x+1}{3}>2" align="absmiddle" class="latex-formula">
2*12" alt="\frac{(x-5)*12}{4}-\frac{(x+1)*12}{3}>2*12" align="absmiddle" class="latex-formula">
24" alt="(x-5)*3-(x+1)*4>24" align="absmiddle" class="latex-formula">
24" alt="3x-15-4x-4>24" align="absmiddle" class="latex-formula">
24+19" alt="-x>24+19" align="absmiddle" class="latex-formula">
43" alt="-x>43" align="absmiddle" class="latex-formula">
Ответ: x∈(-∞; -43[
3)
Ответ: x∈(-∞; 18]
4) (2x-3)² + (3-4x)·(x+5) ≥ 82
4x² - 12x + 9 + 3x - 4x² + 15 - 20x ≥ 82
- 29x + 24 ≥ 82
- 29x ≥ 82 - 24
- 29x ≥ 58
- 29x : (- 29) ≤ 58 : (- 29)
x ≤ - 2
Ответ: x∈(-∞; - 2]
5)
ОДЗ: 4 - 13x ≥ 0
- 13x ≥ - 4
- 13x : (- 13) ≤ - 4 ^ (- 13)
x ≤ ⁴/₁₃
Ответ: (-∞; ⁴/₁₃]