Пошаговое объяснение:
1)
x=1,(12) тогда
100х=112,(12)
100x - x = 112,(12) - 1,(12)
99x = 111
x = 111/99 = 37/33 = 1 4/33
2)
х = 2,5 (14) = 2,51414
100х = 100 * 2,51414 = 251,414
100 х - х =251,414 - 2,514
99х = 251 -2
99х = 249
х =249/99
х = 83/33 = 2 17/33
