\[Страница\ 20\]
\[\boxed{\mathbf{47.}}\]
\[11 - 4 - 6 = 7 - 6 = 1\]
\[7 + 9 - 8 = 7 + 1 = 8\]
\[6 + 5 - 3 = 6 + 2 = 8\]
\[8 + 9 - 10 = 17 - 10 = 7\]
\[13 - 9 + 7 = 4 + 7 = 11\]
\[14 - 8 + 3 = 6 + 3 = 9\]
\[12 - 5 + 7 = 7 + 7 = 14\]
\[16 - 7 + 7 = 16\]
\[\boxed{\mathbf{48.}}\]
\[29 = 20 + 9\]
\[75 = 70 + 5\]
\[60 = 68 - 8\]
\[38 = 30 + 8\]
\[87 = 80 + 7\]
\[9 = 49 - 40\]
\[\boxed{\mathbf{49.}}\]
\[11 - 5 < 8\]
\[11 - 5 = 6\]
\[11 - 5 > 2\]
\[15 - 9 < 8\]
\[15 - 9 = 6\]
\[15 - 6 > 2\]
\[6 + 4 > 8\]
\[6 + 4 > 6\]
\[6 + 4 > 2\]