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МатематикаРешебник по математике 6 класс Ерина Виленкин рабочая тетрадь Часть 1, 2 Часть 2 | Страница 54
Страница 54
\[Стр.\ 54.\]
\[\boxed{\mathbf{8.}}\]
| \[a\] | \[2\] | \[4\] | \[- 5\] | \[10\] | \[- 7\] | \[\frac{1}{2}\] | \[- \frac{2}{3}\] | \[- 0,7\] | \[- 1,2\] | \[- 1\frac{1}{5}\] | \[- \frac{3}{4}\] | \[1,5\] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| \[b\] | \[3\] | \[- 7\] | \[8\] | \[- 8\] | \[- 2\] | \[- \frac{4}{5}\] | \[\frac{3}{4}\] | \[- 0,1\] | \[0,5\] | \[- 0,6\] | \[- \frac{3}{4}\] | \[- \frac{2}{3}\] |
| \[a \cdot b\] | \[6\] | \[- 28\] | \[- 40\] | \[- 80\] | \[14\] | \[- \frac{2}{5}\] | \[- \frac{1}{2}\] | \[0,07\] | \[- 0,6\] | \[0,72\] | \[\frac{9}{16}\] | \[- 1\ \] |
\[\boxed{\mathbf{9.}}\]
\[\textbf{а)} - 6 \cdot 2 = - 12\]
\[- 4 \cdot ( - 5) = 20\]
\[7 \cdot ( - 3) = - 21\]
\[8 \cdot 3 = 24\]
\[\textbf{б)} - 7 \cdot 1 = - 7\]
\[- 5 \cdot ( - 1) = 5\]
\[6 \cdot ( - 1) = - 6\]
\[- 9 \cdot 0 = 0\]
\[\textbf{в)} - 5 \cdot 4 = - 20\]
\[0 \cdot ( - 10) = 0\]
\[( - 9) \cdot ( - 3) = 27\]
\[9 \cdot ( - 1) = - 9\]
\[\boxed{\mathbf{10.}}\]
\[\textbf{а)}\ ( - 4)^{2} = 16\]
\[( - 2)^{3} = - 8\]
\[( - 5)^{2} = 25\]
\[( - 2,75)^{2} = 7,5625\]
\[( - 1,2)^{2} = 1,44\]
\[\left( - \frac{3}{4} \right)^{2} = \frac{9}{16}\]
\[\textbf{б)}\ ( - 0,2)^{2} = 0,04\]
\[( - 0,3)^{3} = - 0,027\]
\[( - 9)^{2} = 81\]
\[( - 7)^{3} = - 343\]
\[\left( - 1\frac{1}{2} \right)^{3} = - \frac{9}{4} = - 2\frac{1}{4}\]
\[\boxed{\mathbf{11.}}\]
\[\textbf{а)}\ - 7 \cdot ( - 2) > 0\]
\[- 9 \cdot 5 < 0\]
\[- 6 \cdot ( - 8) > 0\]
\[- 20 \cdot ( - 20) > 0\]
\[\textbf{б)}\ 7 \cdot ( - 2) < 0\]
\[8 \cdot ( - 9) < 0\]
\[- 1 \cdot ( - 11) > 0\]
\[- 2 \cdot 0,3 < 0\]
\[\textbf{в)} - 13 \cdot 0 = 0\]
\[- 16 \cdot 1 < 0\]
\[0 \cdot ( - 5) = 0\]
\[- 0,7 \cdot ( - 6) > 0\]
