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Pls ajutor! Aflati numarul a stiind ca : [100-(85:5+a)x2+289]x(2x3x4x5:2:3:5+1)=1775

Răspuns :

[100-(85:5+a)×2+289]×(2×3×4×5:2:3:5+1)=1775
[100-(85:5+a)×2+289]×5=1775
(100-(17-a)×2+289)×5=1775
(100-34-2a+289)×5=1775
100-34-2a+289=1775/5
100-34-2a+289=355
-2a=355-100+34-289
a=0/-2
a=0