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ClaudiaSerbu
a fost răspuns

calculati sumele:
a) (3+5+7+...+2015) -2-4-6-...-2014
b) (2+4+6+...+2016) -1-3-5-...-2015
Dau coroana !!! Plsssss!!!

Răspuns :

(3+5+7+...+2015)-2-4-6-...-2014= =( 3-2)+(5-4)+(7-6)+...+(2015-2014)= =1+1+1+....+1=1 x 1007 = 1007 (2015-3):2+1=1007

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