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Rozwiąż równanie:
√(2/5)×(5/2)°=4/25
(2/5)dop pot 1/2 x (2/5)⁻°=(2/5)²
(2/5) do pot (1/2 -x ) =(2/5)²
1/2 -x =2
-x=2-1/2
-x=1½
x=-1½