Răspuns :
[tex]\it \left.\begin{aligned}b\ \ |\rule{50}{0.7}|\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \\ a\ \ |\rule{50}{0.7}|\ ...\ +18\ ...\ |\end{aligned}\right\}\ 154\\ \\ \\ b=(154-18):2=68\\ \\ \\ a=68+18=[/tex]
[tex]\it \left.\begin{aligned}b\ \ |\rule{50}{0.7}|\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \\ a\ \ |\rule{50}{0.7}|\ ...\ +18\ ...\ |\end{aligned}\right\}\ 154\\ \\ \\ b=(154-18):2=68\\ \\ \\ a=68+18=[/tex]