\[\boxed{\text{280.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
Пояснение.
Решение.
\[\textbf{а)}\ a = 59,678\ldots \approx 59,7\]
\[b = 43,123\ldots \approx 43,1\]
\[a - b = 59,7 - 43,1 = 16,6\]
\[\textbf{б)}\ a = 59,678\ldots \approx 59,68\]
\[b = 43,123\ldots \approx 43,12\]
\[a - b = 59,68 - 43,12 = 16,56\ \]