\[\boxed{\mathbf{Проверьте\ себя.\ Страница\ 56}}\]
\[\boxed{\mathbf{Проверочная\ работа.\ Умножение}}\]
\[\boxed{\text{1.}}\]
\[- 3 \cdot ( - 13) = a\]
\[a = 39.\]
\[a \cdot ( - 0,1) = b\]
\[39 \cdot ( - 0,1) = b;\]
\[b = - 3,9.\]
\[b \cdot ( - 2) = c\]
\[- 3,9 \cdot ( - 2) = c\]
\[c = 7,8.\]
\[- \frac{1}{3} \cdot c = d\]
\[- \frac{1}{3} \cdot 7,8 = d\]
\[d = - 2,6.\]
\[Ответ:d = - 2,6.\]
\[\boxed{\text{2.}}\]
\[\textbf{а)}\ ( - 0,1)^{2} > 0\]
\[\textbf{б)} - {0,1}^{2} < 0\]
\[\textbf{в)}\ ( - 3)^{3} < 0\]
\[\textbf{г)} - ( - 3)^{3} > 0\ \]
\[\boxed{\text{3.}}\]
\[\textbf{а)}\ 3:\]
\[- 4 \cdot 3 = - 12.\]
\[\textbf{б)} - 14:\]
\[- 4 \cdot ( - 14) = 56.\]
\[\textbf{в)}\ \frac{1}{4}:\]
\[- 4 \cdot \frac{1}{4} = - 1.\]
\[\textbf{г)}\ 0:\]
\[- 4 \cdot 0 = 0.\]
\[\boxed{\text{4.}}\]
\[\textbf{а)}\ 3 \cdot ( - 6) - 2 \cdot ( - 4) + 3 \cdot ( - 5) =\]
\[= - 18 + 8 - 15 = - 25\]
\[\textbf{б)} - 1\frac{1}{2} \cdot \left( - \frac{2}{3} \right) - 2\frac{5}{6} \cdot \left( - 1\frac{1}{2} \right) =\]
\[= \frac{3}{2} \cdot \frac{2}{3} + \frac{17}{6} \cdot \frac{3}{2} = 1 + \frac{17}{4} =\]
\[= 1 + 4\frac{1}{4} = 5\frac{1}{4}\]
Глава 34. Действие деления