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Efectuati; a-[b-(c-d)]
b) x-[y-(3x+y-5)]+5-4x


Răspuns :

[tex]b) x-[y-(3x+y-5)]+5-4x=x-[y-3x-y+5]+5-4x=\\=x-[-3x+5]+5-4x=x+3x-5+5-4x=0[/tex]