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[(0,2)⁵ razy (0,2)⁷]:[(0,2)³]³ = 0,2¹² : 0,2⁹ = 0,2³ = 0,008
zad 2
(2a - b)(2a + b) + (a - b)² = 4a² - b² + a² - 2ab + b² = 5a² - 2ab = a(5a - 2b)
zad 3
2(x - 3)² - ½ ≥ (2x + 3)(2x - 3)/2 - x
2(x² - 6x + 9) - ½ ≥ (4x² - 9)/2 - x każdy czynnik mnożymy przez 2
4x² - 24x + 36 - 1 ≥ 4x² - 9 - 2x
4x² - 4x² - 24x + 2x ≥ - 9 - 36 + 1
- 22x ≥ - 34
x ≤ 34/22
x ≤ 1½