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2\3 + 4\9 - 5\27 + 1\2

Răspuns :

9×(2/3)+3×(4/9)-5/27+1/2=18/27+12/27-5/27+1/2=2×(18/27)+2×(12/27)-2×(5/27)+27×(1/2)=(36+24-10+27)totul supra 54=77/54