\[Стр.\ 52.\]
\[33.\ Действие\ умножения\]
\[\boxed{\mathbf{1.}}\]
\[1)\ модули;\ \ минус.\]
\[2)\ модули.\]
\[\boxed{\mathbf{2.}}\]
\[+\] | \[-\] |
---|---|
\[3 \cdot 21\] | \[( - 1,2) \cdot 0,3\] |
\[( - 6) \cdot ( - 8)\] | \[3,2 \cdot ( - 9)\] |
\[\left( - \frac{1}{4} \right) \cdot ( - 7)\] | \[( - 5) \cdot 25\] |
\[14 \cdot 2\] | \[3 \cdot ( - 6)\] |
\[\boxed{\mathbf{3.}}\]
\[\textbf{а)}\ 5 \cdot 9 = 45\]
\[( - 4) \cdot ( - 6) = 24\]
\[( - 7) \cdot 20 = - 140\]
\[\textbf{б)}\ ( - 7) \cdot ( - 3) = 21\]
\[2 \cdot ( - 8) = - 16\]
\[( - 3) \cdot ( - 9) = 27\]
\[\textbf{в)}\ 12 \cdot 5 = 60\]
\[( - 11) \cdot 6 = - 66\]
\[( - 15) \cdot 3 = - 45\]
\[\textbf{г)}\ ( - 5) \cdot 8 = - 40\]
\[( - 9) \cdot ( - 7) = 63\]
\[3 \cdot ( - 6) = - 18\]
\[\textbf{д)}\ ( - 7) \cdot 9 = - 63\]
\[25 \cdot 4 = 100\]
\[44 \cdot ( - 1) = - 44\]
\[\textbf{е)}\ ( - 13) \cdot 6 = - 78\]
\[( - 16) \cdot ( - 5) = 80\]