Răspuns :
0,(4)=4/9
0,2(6)=26/90
3x+1=4/9·9/10:26/90
3x+1=36/90·90/26
3x+1=36/26 simplificam
3x+1=18/13
3x=18/13-1
3x=5/13
x=5/3·13
x=5/39
x=0,(128205)
0,2(6)=26/90
3x+1=4/9·9/10:26/90
3x+1=36/90·90/26
3x+1=36/26 simplificam
3x+1=18/13
3x=18/13-1
3x=5/13
x=5/3·13
x=5/39
x=0,(128205)