Odpowiedzi

2009-05-07T22:03:47+02:00
(x²-2x+1)/3 + 2/3x² ≤ x²+2x+1
x²-2x+1 +2x² ≤3x² + 6x +3
8x≥-2
x≥-1/4
2009-05-07T22:11:39+02:00
(x²-2x+1)/3+2/3x²≤x²+2x+1/×3
x²-2x+1+2x²≤3x²+6x+3
x²-2x+2x²-3x²-6x≤3-1
-8x≤2/÷(-8)
x≥-1/4
2009-05-07T22:17:27+02:00
(x-1)²:3+2:3x²≤(x+1)²
(x²-2x+1):3+⅔x²≤x²+2x+1
⅓x²-⅔x+⅓+⅔x²≤x²+2x+1
⅓x²-⅔x+⅔x²-x²-2x≤1-⅓
-2⅔x≤⅔/(-2⅔)
x≥-¼