a) 0,124;=124/1000; 5= 25/5; -5,2= -52/10; 3,0415=30415/10000
-16,0303=-160303/10000: 12=144/12; 15,0=150/10; 36,450=3645/100 -12,700= -127/10
b)2,(1)=19/9; 0,(15)= 15/99 ; -0,(15) = -15/99; 17,(03)=1686/99;
9,(22)= 913/99; 4,(0)= 36/9; -1,(111)=1110/999; 0,4040404= 0,(40)=40/99
c) 0,315415415= 0,3(154)= 3151/9990
2,1(3)= 192/90; 0,2(10)=208/990; -5,4(12)=5358/990; 10,35(1)=; -1,40(12);
1,1(123)=11112/9990; 0,6(44)=638/990; -2,55(55)=25300/9900;
4,13(3)= 3720/900; 4,1(3)=372/900; -0,0(2)=2/9
-0,01(023)= 1022/99900