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2. 9 x do kwadratu 1/9 - y do kwadratu 1/4
3. 144
(a½-3)(a½+3)=¼a²-9
jeśli ½ to potegi
(a½-3)(a½+3)=a-9
(3x⅓-y½)²=9x^⅔-6x^⅓y^½+y
(3√2-2√2)² =18-24+8=2