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1-2+3-4+5-6+... +49-50​

Răspuns :

[tex]1 - 2 +3 - 4 + 5 - 6 - + ... + 49 - 50 = [/tex]

[tex] - 1 + ( - 1) + ( - 1) + ... + ( - 1) = [/tex]

[tex] = 25 \times ( - 1) = - 25[/tex]