0,12(3) = ( 123 - 12) /900 = 111 / 900 = 37 / 300
0,1(23) = ( 123 - 1 ) / 990 = 122 / 990 = 61 / 495
2,1(15) = 2 + 0,1(15 ) = 2 + ( 115 -1) /990 = 2 + 114 / 990 = 2 + 57 /495 =
= 2 + 19 / 165 = 349 /165
2,11(51) -1,2(333) = 2 + 0,11(51) - 1 - 0,2(333) = 1 + ( 1151 -11 ) / 9900 -
- ( 2333 -2) /9990 = 1 + 1140 /9900 - 2331 /9990=
= 1 + 114 / 990 - 259 / 1110 = 1 + ( 114 · 1110 - 259 ·990) /990·1110 =
= 1 +( 126540 - 256410 ) / 990 ·1110 =
= 1 - 129870 /990 ·1110 = 1 - 12987 /99 ·1110 =
= 96903 / 99 ·1110 = 10767 / 11 · 1110
0,12(12) = ( 1212 - 12) / 9900 = 1200 /9900 =12 /99 = 4 / 33
0,164646 = 0,1(64) = ( 164 -1) / 990 =163 / 990