حاصل عبارت های زیر را به دست آورید.

پاسخ

$$
(\frac{3}{5} - (+\frac{2}{5})) \times \frac{5}{12} = (\frac{3-2}{5}) \times \frac{5}{12} = \frac{1}{5} \times \frac{5}{12} = \frac{1}{12}\\[2ex]
(-\frac{3}{5}) \div (-\frac{2}{5} + \frac{5}{6}) = -\frac{3}{5} \div (\frac{-12+25}{30})=-\frac{3}{5} \div \frac{13}{30} = -\frac{3}{5} \times \frac{30}{13} = -\frac{18}{13}\\[2ex]
(\frac{2}{5} - \frac{3}{5} - \frac{7}{5} + \frac{4}{5} ) \times (-\frac{5}{3}) = (\frac{2-3-7+4}{5}) \times (-\frac{5}{3}) = -\frac{4}{5} \times (-\frac{5}{3}) = \frac{4}{3}\\[2ex]
(-\frac{3}{8}+\frac{1}{6}-\frac{8}{9}) \div \frac{-7}{24} = (\frac{-27+12-64}{72}) \div \frac{-7}{24}= -\frac{79}{72} \div (-\frac{7}{24}) = -\frac{79}{72} \times (-\frac{24}{7}) = \frac{79}{21}\\[2ex]
(-2+3-7)+(-\frac{1}{3}+\frac{2}{5}-\frac{1}{15}) = -6+(\frac{-5+6-1}{15}) = -6+\frac{0}{15} = -6+0=-6\\[2ex]
-1\frac{1}{2} \times (-3\frac{1}{3}) = -\frac{3}{2} \times (-\frac{10}{3}) = 5\\[2ex]
-4\frac{1}{2} \div 1\frac{1}{4} = -\frac{9}{2} \div \frac{5}{4} = -\frac{9}{2} \times \frac{4}{5} = -\frac{18}{5}\\[2ex]
-1\frac{2}{3} - 1\frac{1}{4} \times \frac{-8}{5} = -\frac{5}{3} - \frac{5}{4} \times \frac{-8}{5} = -\frac{5}{3} + (\frac{40}{20}) = -\frac{5}{3} + \frac{2}{1} = \frac{-5+6}{3} = \frac{1}{3}
$$