Αν
$1+2+3=10$
$2+3+4=13$
$4+5+6=19$
$5+6+7=22$
τότε
$6+7+8=?$
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$\begin{gathered}
ΑπάντησηΔιαγραφή1*2*3 = 1 + 2 + 3 + 4 = 10 \hfill \\
2*3*4 = 2 + 3 + 4 + 4 = 13 \hfill \\
4*5*6 = 4 + 5 + 6 + 4 = 19 \hfill \\
5*6*7 = 5 + 6 + 7 + 4 = 22 \hfill \\
6*7*8 = 6 + 7 + 8 + 4 = 25 \hfill \\
\end{gathered} $