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Calculati:
●-1 +(+2) -3 + (+4) - ... - 99 +(+100) - 101
Explicati-mi,va rog.​


Răspuns :

[tex]\it -1 +(+2) -3 + (+4) - ... - 99 +(+100) - 101 =\\ \\ = (100-99) + (98-97) + (96 - 95) + ... +(4-3) + (2-1) -101 =\\ \\ = \underbrace{\it1+1+1+\ ...\ +1}_{50\ termeni}-101=50-101=-51[/tex]