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Sasarmangabrie
a fost răspuns

efectuati:
b) (4+8+12+...2016):2+4+6+...+1008)

c)5+10+15+20+...+2015

d)25+50+75+...+2000

Răspuns :

Spidie
b) (4+8+12+...2016):2+4+6+...+1008)=
=4*( 1+2+3+...+504) : 2*( 1+2+3+...+504)=4:2=2

c)5+10+15+20+...+2015=5*(1+2+3+...+403)=5*403*404/2= 407030

d)25+50+75+...+2000 =25* (1+2+3+...+80)=25*80*81/2=81000


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