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[55×5-(199-99×2+20×5)+220÷10]÷4

Răspuns :

[275-(199-198+100)+22]:4=
=[275-(1+100)+22]:4=
=(275-101+22):4=
=(174+22):4=
=196:4=
=49

rezolvare:
275-(199-198+100)+22):4=
(275-101+22):4=
(174+22):4=
196:4=49