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(x-2)(x+2)(x-1)=0
rozwiązania to x=2 x=-2 x=1
suma -2+2+1=1
x² - 4 = 0 lub x - 1 = 0
x² = 4 lub x = 1
x = √4 lub x = 1
x = 2 lub x = - 2 lub x = 1