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X la putere 2 = 49 supra 64

Răspuns :

x² = 49/64 
x = √ (49/64) 
x1 = 7/8
x2 = - (7/8)
x²=49/64
x=√49/64
x=√49/√64
x₁=7/8     ,   x₂= - 7/8