Question

1,(4)x patrat - 1 = (0,(2))la patrat. x la patrat = ?

Answer 1

1,(4)×X^2×-1=0,0(2)^2
13/9×X^2×-1=2/90×2/90
13/9×X^2=4/90
X^2=4/90:13/9=4/90×9/13

4×9
X^2=------------=4/130
90×13
^=putere
linia punctata de mai sus ar trebui sa fie o linie de fractie