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3:(2 3/4 - 1 15/28)+2/3:3/2

Răspuns :

3: (11/4- 43/28)+2/3: 3/2=3: (77-43)28+2/3*2/3=3*28/34+4/9=84/34+4/9=
= 42/17+4/9=( 378+68)/153 = 446/153