Question

Ma ajuta cnv?Dau coroană!
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Answer 1

Răspuns:

$a=\frac{1}{2}+\frac{2}{3}+\frac{3}{4}+\frac{4}{5}$

$b=\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}$

$a+b=\frac{1}{2}+\frac{2}{3}+\frac{3}{4}+\frac{4}{5}+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}=\frac{1}{2}+\frac{1}{2}+\frac{2}{3}+\frac{1}{3}+\frac{3}{4}+\frac{1}{4}+\frac{4}{5}+\frac{1}{5}=1+1+1+1=4$

Explicație pas cu pas: