حاصل عبارت های زیر را به دست آورید.

پاسخ

$$
(-2\frac{1}{2}+1\frac{1}{3}) \div (-1\frac{1}{4} \times \frac{-2}{5}) \\
= (-\frac{5}{2}+\frac{4}{3}) \div (-\frac{5}{4} \times \frac{-2}{5}) \\
= (\frac{-15+8}{6}) \div (+\frac{1}{2}) \\
= -\frac{7}{6} \div \frac{1}{2} \\
= -\frac{7}{6} \times \frac{2}{1} \\
= -\frac{7}{3}
$$
$$
1-\frac{1-1\frac{1}{2}}{-1+1\frac{1}{2}} \\
=1 - \frac{\frac{1}{1} - \frac{3}{2}}{-\frac{1}{1} + \frac{3}{2}}\\
= 1 - \frac{\frac{2-3}{2}}{\frac{-2+3}{2}} \\
= 1 - \frac{\frac{-1}{2}}{\frac{1}{2}}\\
=1- (-\frac{1}{2} \div \frac{1}{2})\\
= 1 - (-\frac{1}{2} \times \frac{2}{1})\\
= 1 - (-1)\\
= 1 + 1 = 2
$$