Question

cine poate sa îmi zica la ex 3 ms

Answer 1

x=2 supra 5+3 supra 6 +4 supra 7=9 supra 18+47 supra 50 =56 supra 68
y= 8 supra 5 +9 supra 6 +10 supra 7 =27 supra 18 +53 supra 50 = 80 supra 60 sper ca team ajutat 

Answer 2

Observam ca daca cuplezi termenii sumelor 2 cate 2 atunci o sa obtii 2 la fiecare termen
$\frac{2}{5}+\frac{8}{5}=\frac{10}{5}=2$
$\frac{3}{6}+\frac{9}{6}=\frac{12}{6}=2$
$\frac{4}{7}+\frac{10}{7}=\frac{14}{5}=2$
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$\frac{47}{50}+\frac{53}{50}=\frac{100}{50}=2$
exista 50-5+1=46 Astfel de cupluri, asadar daca le adunam
$\frac{2}{5}+\frac{3}{6}+\frac{4}{7}+..+\frac{47}{50}+\frac{8}{5}+\frac{9}{6}+\frac{10}{7}+..+<span>\frac{53}{50}=x+y=2*46</span>$
Acum facel media aritmetica intre x si y
$m_{a}=\frac{x+y}{2}=\frac{2*46}{2}=46$