Apskati piemēru un risini!
Piemērs:
Dotaja piemērā skaitli $$30$$ veido divi saskaitāmie $$10$$ un $$20$$.

$\begin{array}{l}\phantom{\rule{0.882em}{0ex}}30\\ ↙↘\\ 10\phantom{\rule{1.029em}{0ex}}20\end{array}$
 $\begin{array}{l}\phantom{\rule{0.147em}{0ex}}i\\ ↙↘\\ 60\phantom{\rule{1.176em}{0ex}}10\end{array}$ $\begin{array}{l}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}60\\ \phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}↙↘\\ i\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}30\end{array}$ $\begin{array}{l}\phantom{\rule{1.323em}{0ex}}90\\ \phantom{\rule{0.294em}{0ex}}↙↘\\ 10\phantom{\rule{0.735em}{0ex}}i\end{array}$

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