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S1= 1+(-2)+3+(-4)+5+(-6)+7+(-8)+5+(-10)
ajutati-ma repede, va rog


Răspuns :

[tex]S _{1} = 1+(-2)+3+(-4)+5+(-6)+7+(-8)+5+(-10) S_{1} =1-2+3-4+5-6+7-8+5-10 S_{1} = -9 ------CLAUAND ---------[/tex]