Question

[0,(3) : 0,1(3)- 1 supra 2] totul la -1

Answer 1

[3/9:(13-1/)90-1/2]^-1=
(1/3:12/90-1/2)^-1=
(1/3×15/2-1/2)^-1=
(15/6-1/2)^-1=
aducând la același numitor 6
[(15-3)/6]^-1=
(12/6)^-1=
6/12=
1/2