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Răspuns:
1,(2)-0,(12)-1,2=
1,(2)=(12-1)/9=11/9
0,(12)=12/99=4/33
1,2=12/10
¹⁰⁰⁾11/9-³⁰⁾4/33-⁹⁹⁾12/10=1100/990-120/990-1188/990=-208/990