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va rog frumos ajutatima la intrebarea aceasata: cat face 2-(54+67-78+67)-78+90

Răspuns :

2-(121-78-+67)-78+90= 2-(43+67)-78+90= 2-110-78+90= -108-78+90= -186+90= -96
2-(54+67-78+67)-78+90=
2-(121-78+67)-78+90=
2-(43+67)-78+90=
2-110-78+90=
(-108)-78+90=
(-186)+90= -96