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0,25=25/100= 1/4
0,(02)= 2/99
(25/99 - 1/4 ) : 2/99=
in paranteza aduc la acelasi numitor, numitorul comun este 396
(100/396 - 99/396) : 2/99=
1/396 : 2/99=
1/396 x 99/2=
1/4 x 1/2= 1/8= 0,125