rozwiaż równanie -xkwadrat +2 pierwiastki z 2x -2=0
-x²+2√2x-2=0
x²-2√2x+2=0
(x-√2)²=0
x-√2=0
x=√2
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-x²+2√2x-2=0
x²-2√2x+2=0
(x-√2)²=0
x-√2=0
x=√2