عبارت های زیر را مانند نمونه به صورت جمع دو عدد گویا بنویسید.

پاسخ

$$
\frac{5}{8} - \frac{7}{8} = \frac{5}{8} + (-\frac{7}{8})= -\frac{2}{8} = - \frac{1}{4}\\[2ex]
\frac{3}{5} - \frac{4}{5} = \frac{3}{5} + (-\frac{4}{5})= -\frac{1}{5}\\[2ex]
-\frac{3}{5} - (+\frac{4}{5}) = -\frac{3}{5} + (-\frac{4}{5})= -\frac{7}{5}\\[2ex]
0.5 - 0.85 = \frac{5}{10} - \frac{85}{100} = \frac{5}{10} + (-\frac{85}{100}) = \frac{50}{100} +(- \frac{85}{100}) = -\frac{35}{100} = -\frac{7}{20}\\[2ex]
-2.3-5.8 = -2\frac{3}{10} - 5\frac{8}{10} = -\frac{23}{10} - \frac{58}{10} = -\frac{23}{10} + (-\frac{58}{10})= -\frac{81}{10}\\[2ex]
-12.3 - (-7) = -12\frac{3}{10} - (-7) = -\frac{123}{10} + \frac{7}{1} = -\frac{123}{10} + \frac{70}{10} = -\frac{53}{10}\\[2ex]
25-18.4 = 25 -18\frac{4}{10} = \frac{25}{1}- \frac{184}{10} =\frac{250}{10} - \frac{184}{10} = \frac{250}{10} + (-\frac{184}{10})= \frac{66}{10} = \frac{33}{5}
$$