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0,(3)x^2=27 supra 256

Răspuns :

x ² = 27 ·3/256
x ² = 9²  / 16²
x ² = [ 9/ 16 ]²
x=9/16  si x = -9 /16
0,(3)=3/9=1/3; 1/3x^2=27/256<=>x^2/3=27/256<=>256x^2=27×3 =>x^2=81/256=>x=+_9/16=+_0,56