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100a = 227,27272727... = 227,(27)
100a - a = 227,(27) - 2,(27)
99a = 225
a = 225/99 = 25/11
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b = -0,112121212... = -0,1(12)
100b = -11,2121212... = -11,2(12)
100b - b = -11,2(12) + 0,1(12)
99b = -11,1
b = -11,1 ÷ 99 = -111/990
b = -37/330