Răspuns:
a) 0,(x) = 5
x/9=5
x=9×5
x=45
b) 3,4(x) = 311;
(34x-34)/90=311
34x-34=90×311
34x=27990+34
34x=28024
300+40+x=28024
x=28024-340
x=27684
c) 4, (x) = 4
(36+x)/9=4
36+x=9×4
36+x=36
x=36-36
x=0
d) 5,(x) = 53;
(45+x)/9=53
45+x=53×9
45+x=477
x=477-45
x=432
e) 5,(x) = 5 13
(45+x)/9=5,13
45+x=9×5,13
45+x=46,17
x=46,17-45
x=1,17