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Ex 5 repede dau si coronita

Ex 5 Repede Dau Si Coronita class=

Răspuns :

A=2017+2×(1+2+....+2016)=2017+2×2016×2017/2=2017+2016×2017=2017×(1+2016)=2017×2017
A:2017=2017×2017:2017=2017
a+b+c=56⇒6c+13+3c+3+c=56⇒10c=40⇒c=4
a:b=2   7⇒a=2b+7⇒a=2(3c+3)+7⇒a=6c+13⇒a=37
b:c=3   3⇒b=3c+3⇒b=15

Vf. 37+15+4=56

scuze l am rezolvat pe 6!