○ 1,7 = 17/10
○ -2,5 = -25/10 = -5/2
○ 12,312 = 12312/1000 = 1539/125
○ 0,(4) = 4/9
○ 12,(462) = (12462-12)/999 = 12450/999 = 4150/333
○ 2,03 = 203/100
○ -0,6 = -6/10 = -3/5
○ -23,5436 = -235436/10000 = 58859/2500
○ 2,(23) = (223-2)/99 = 221/99
○ -1,(12) = -(112-1)/99 = -111/99 = -37/33
○ -10,2(4) = -(1024-102)/90 = 922/90 = 461/45
○ -5,01(2) = -(5012-501)/900 = -4511/900