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b)
x=0,3(1)
10x=3,(1)
100x= 31,(1)
100x-10x=31,(1)-3,(1)
90x=28 /:90
x=28/90 = 14/45
c) x=0,(102)
1000x=102,(102)
1000x-x=102,(102) - 0,(102)
999x=102 /:999
x=102/999 = 34/333