\[\mathbf{Страница\ 44.}\]
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\[75\ :(3 \cdot 5) = 75\ :15 = 5\ (И)\]
\[64\ :32 + 9 = 11\ (Л)\]
\[75\ :(3 \cdot 25) = 75\ :75 = 1\ (У)\]
\[18 \cdot 5 - 42 = 90 - 42 = 48\ (Р)\]
\[84\ :21 + 15 = 4 + 15 = 19\ (Т)\]
\[81 - 19 \cdot 3 = 81 - 57 = 24\ (Г)\]
\[9 + 3 \cdot 7 = 9 + 21 = 30\ (Н)\]
\[16 \cdot 6 - 7 = 96 - 7 = 89\ (Ь)\]
\[42 - 13 \cdot 3 = 42 - 39 = 3\ (К)\]
\[92 - 18 \cdot 3 = 92 - 54 = 38\ (О)\]
\[15 \cdot 4 + 16 = 60 + 16 = 76\ (Е)\]
\[Зашифрованное\ слово:\]
\[ТРЕУГОЛЬНИК.\]
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\[Прямая\ \text{BC.}\]
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\[\boxed{\mathbf{11.}}\]