\[\boxed{\mathbf{Страница}\mathbf{\ \ 51}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{17}\mathbf{.}\mathbf{\ }}\]
\(13;\ \ 26;\ \ 39\)
\(30;41;52;63;74;85;96\)
\(50;\ \ 51;\ \ 52;\ \ 53;\ \ 56;\ \ 57;\ \ \)
\[51;\ \ 52;\ \ 54;\ \ 55;\ \ 58;\ \ 59\]
\(19;\ \ 39;\ \ 69;\ \ 29;\ \ 49;\ \ 59;\ \ \)
\[79;\ \ 89;\ \ 99\]
\(10;\ \ 32;\ \ 54;\ \ 21;\ \ 43;\ \ 65;\ \ \)
\[76;\ \ 87;\ \ 98\]
\(10;\ \ 20;\ \ 30;\ \ 40;\ \ 50;\ \ 60;\ \ \)
\[70;\ \ 80;\ \ 90\]
\[\boxed{\mathbf{18}\mathbf{.}\mathbf{\ }}\]
\[S = 18\ см^{2}\text{.\ }\]
\[a = 1\ см;\ \ b = 18\ см:\]
\[P = 2 \cdot (1 + 18) = 38\ см.\]
\[a = 2\ см;\ b = 9\ см:\ \]
\[P = 2 \cdot (2 + 9) = 22\ см.\]
\[a = 3\ см;\ \ b = 6\ см:\]
\[P = 2 \cdot (3 + 6) = 18\ см.\]
\[\boxed{\mathbf{19}\mathbf{.}\mathbf{\ }}\]
\[8 \cdot 4 - 4 \cdot 2 = 32 - 8 = 24\]
\[6 \cdot 7 + 4 = 42 + 4 = 46\]
\[45\ :9 - 3 = 5 - 3 = 2\]
\[32\ :4 + 48\ :6 = 8 + 8 = 16\]
\[14 + 9 \cdot 3 = 14 + 27 = 41\]
\[55 - 6 \cdot 5 = 55 - 30 = 25\]