Oblicz :
= 4
x^2=4
x=V4, czyli
x=2 lub x=-2
x²=4
x=√4 =2 v x= -√4= -2
{ -2,2}
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x^2=4
x=V4, czyli
x=2 lub x=-2
x²=4
x=√4 =2 v x= -√4= -2
{ -2,2}