Răspuns:
Explicație pas cu pas:
2,(3) = (23-2)/9 = 21/9 = 7/3
1,2 = 12/10 = 6/5
0,68 = 68/100 = 17/25
0,(6) = 6/9 = 2/3
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(7/3 - 6/5) : 17/25 - 2/3 = (35/15 - 18/15) : 17/25 - 2/3 = 17/15 : 17/25 - 2/3 =
= 17/15 * 25/17 - 2/3 = 25/15 - 2/3 = 5/3 - 2/3 = 3/3 = 1