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a fost răspuns

Efectuati sumele:
C) 2/4+4/8+6/12+....+280/560

Răspuns :

=1/2+1/2+1/2+....+1/2(de 140 de ori)=140•1/2=140/2=70
Rayzen
[tex] \frac{2}{4}+ \frac{4}{8}+ \frac{6}{12}+ ...+ \frac{280}{560}= \frac{1}{2}+ \frac{1}{2}+\frac{1}{2}+...+\frac{1}{2} \quad [de \quad 280:2=140 \quad ori] \\ \\ = 140\times \frac{1}{2} = 70[/tex]

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