\[Страница\ 71\]
\[\boxed{\mathbf{126.}}\]
\[16 - 9 + 5 = 12\]
\[3 + 8 + 9 = 20\]
\[12 - 3 + 7 = 16\]
\[74 - 20 + 6 = 60\]
\[60 + 27 + 3 = 90\]
\[57 - 7 - 10 = 40\]
\[\boxed{\mathbf{127.}}\]
\[38 + 4 = 42\]
\[17 + 9 = 26\]
\[35 + 8 = 43\]
\[58 + 7 = 65\]
\[32 - 8 = 24\]
\[23 - 6 = 17\]
\[44 - 9 = 35\]
\[63 - 5 = 58\]
\[63 + 7 = 70\]
\[41 + 9 = 50\]
\[60 - 5 = 55\]
\[80 - 8 = 72\]
\[Проверка.\]
\[42 - 4 = 38\]
\[26 - 9 = 17\]
\[43 - 8 = 35\]
\[65 - 7 = 58\]
\[70 - 7 = 63\]
\[50 - 9 = 41\]
\[\boxed{\mathbf{128.}}\]
\[15 - 9 = 6\ (лет) - Саша\]
\[\ старше\ Вити.\]
\[Ответ:на\ 6\ лет.\]