\[Стр.\ 39.\]
\[\boxed{\mathbf{4.}}\]
\[\textbf{а)} - 5 + 10 = 5\]
\[5 + ( - 10) = - 5\]
\[17 + ( - 9) = 8\]
\[\textbf{б)}\ 12 + ( - 4) = 8\]
\[- 24 + 11 = - 13\]
\[65 + ( - 45) = 20\]
\[\textbf{в)}\ 9 + ( - 17) = - 8\]
\[11 + 9 + ( - 4) = 16\]
\[- 40 + ( - 16) + 32 = - 24\]
\[\textbf{г)}\ 200 + 83 = 283\]
\[19 + ( - 8) + ( - 2) = 9\]
\[- 9 + ( - 9) + ( - 9) = - 27\]
\[\boxed{\mathbf{5.}}\]
\[a\] | \[8\] | \[- 6\] | \[- 2\] | \[7\] | \[- \frac{1}{2}\] | \[\frac{3}{4}\] | \[6,5\] |
---|---|---|---|---|---|---|---|
\[b\] | \[5\] | \[6\] | \[7\] | \[- 11\] | \[\frac{1}{4}\] | \[- \frac{1}{8}\] | \[- 2,4\] |
\[a + b\] | \[13\] | \[0\] | \[5\] | \[- 4\] | \[- \frac{1}{4}\] | \[\frac{5}{8}\] | \[4,1\] |
\[a\] | \[- 2,4\] | \[- 1\frac{1}{4}\] | \[1,3\] | \[- 2,6\] | \[14\frac{3}{4}\] | \[- 10\] | \[15\] |
---|---|---|---|---|---|---|---|
\[b\] | \[1,9\] | \[1\frac{1}{4}\] | \[- 2\frac{1}{5}\] | \[3\frac{3}{5}\] | \[- 6,5\] | \[5\] | \[- 3\] |
\[a + b\] | \[- 0,5\] | \[0\] | \[- 0,9\] | \[1\] | \[8,25\] | \[- 5\] | \[12\] |
\[\boxed{\mathbf{6.}}\]
\[\textbf{а)} - 18 + ( - 45) = - 63\]
\[\textbf{б)} - 3,2 + ( - 3,9) = - 7,1\]
\[\textbf{в)} - 16 + 9 = - 7\]
\[\textbf{г)}\ 17 + ( - 5) = 12\]
\[\textbf{д)}\ 90 + ( - 130) = - 40\]
\[\textbf{е)}\ 1 + ( - 0,78) = 0,22\]
\[\textbf{ж)}\ 0,7 + ( - 1,1) = - 0,4\]
\[\textbf{з)}\frac{5}{8} + \left( - \frac{7}{8} \right) = - \frac{1}{4}\]