\[Стр.\ 46.\]
\[\boxed{\mathbf{3.}}\]
\[\textbf{а)}\ 17 - ( - 19) = 17 + 19 = 36\]
\[\textbf{б)} - 19 - 18 = - 19 + ( - 18) =\]
\[= - 37\]
\[\textbf{г)} - 17 - ( - 19) = - 17 + 19 =\]
\[= 2\]
\[\textbf{д)}\ 46 - 60 = 46 + ( - 60) = - 14\]
\[\textbf{е)}\ 29 - ( - 40) = 29 + 40 = 69\]
\[\textbf{ж)} - 27 - 40 = - 27 + ( - 40) =\]
\[= - 67\]
\[\textbf{з)} - 0,86 - 1 = - 0,86 + ( - 1) =\]
\[= - 1,86\]
\[к)\ 5,81 - ( - 8,72) =\]
\[= 5,81 + 8,72 = 14,53\]
\[л) - 2\frac{3}{8} - \left( - 4\frac{5}{8} \right) =\]
\[= - 2\frac{3}{8} + 4\frac{5}{8} = 2\frac{1}{4}\]
\[м)\ 7\frac{2}{3} - \left( - 1\frac{1}{3} \right) = 7\frac{2}{3} + 1\frac{1}{3} = 9\]