\[\boxed{\mathbf{1}\mathbf{.102.\ ОК\ ГДЗ - домашка\ на\ }5}\]
\[\textbf{а)}\ 27 + 3 = 30\]
\[68 + 2 = 70\]
\[71 + 9 = 80\]
\[55 + 5 = 60\]
\[34 + 26 = 60\]
\[\textbf{б)}\ 52 - 7 = 45\]
\[36 - 9 = 27\]
\[40 - 6 = 34\]
\[23 - 8 = 15\]
\[61 - 4 = 57\]
\[\textbf{в)}\ 9 \cdot 8 = 72\]
\[8 \cdot 7 = 56\]
\[9 \cdot 9 = 81\]
\[6 \cdot 8 = 48\]
\[7 \cdot 0 = 0\]
\[\textbf{г)}\ 53 \cdot 10 = 530\]
\[60\ :10 = 6\]
\[80 \cdot 10 = 800\]
\[1000\ :1000 = 1\]
\[100 \cdot 100 = 10\ 000\]
\[\textbf{д)}\ 45\ :9 = 5\]
\[64\ :8 = 8\]
\[49\ :7 = 7\]
\[30\ :6 = 5\]
\[48\ :8 = 6\]