а) (1/3)² = (1/3)(1/3) = 1/9б) (1/2-2/3)² = (1/2 - 2/3)(1/2 - 2/3) = (1/2 - 2/3)(1/2 - 2/3) = (1/6)(1/6) = 1/36в) (1/2)² - (1/3)² = (1/2 1/2) - (1/3 1/3) = 1/4 - 1/9 = 5/36
а) (1/3)² = (1/3)(1/3) = 1/9
б) (1/2-2/3)² = (1/2 - 2/3)(1/2 - 2/3) = (1/2 - 2/3)(1/2 - 2/3) = (1/6)(1/6) = 1/36
в) (1/2)² - (1/3)² = (1/2 1/2) - (1/3 1/3) = 1/4 - 1/9 = 5/36