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Date: Sun, 20 Jan 2002 12:04:45 +0100
From: Mateusz Adamowski <mateusza@boss.staszic.waw.pl>
Subject: =?ISO-8859-2?Q?Re=3A_Nie_kr=EApujcie_si=EA_moj=B1_obecno=B6ci?=
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On Sun, 20 Jan 2002, Leszek Ciszewski wrote:

> Co to za liczba, kt�ra
> dodana do siebie daje
> taki sam wynik, jaki
> by da�a, gdyby by�a
> przez siebie pomno�ona? :)

x+x = x*x

2x = x^2

-x^2 + 2x = 0

delta = 4 - 4*(-1)*0
delta = 4

x_1 = (sqrt(delta) - 2)/2 * (-1)
x_1 = (2-2)/(-2) = 0/(-2) = 0

x_2 = (-sqrt(delta) - 2)/2 * (-1)
x_2 = (-2-2)/(-2) = (-4)/(-2) = 2

x = 0 lub x = 2

> S� takie dwie.

jak widac... :)

pozdrawiam
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