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8 supra 15: la -11supra 25=

Răspuns :

8/15-11/25
8/15 amplificam cu 5=40/75
11/25 amplificam cu 3=33/75
40/75-33/75=7/75
8/15 : 11/25 =

= 8/15*25/11 =

= 8/3*5/11 = 40/33