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zsumowanie x wynik
x(x²-2x+1) - 2 = 0
x(x² - 2x + 1) = 2
x * x * x - x * x + x * x + x = 2
x³ + x = 2
2x³ = 2 /:2
x³ = 1 / pierwiastek z 3
x = 1
ps. do kolegi wyżej:
x³ to nie to samo co 3x !