c) \( \left(-\frac{3}{2}\right) \div(-2,3) \div\left(+\frac{5}{6}\right)-\left(-\frac{1}{2}\right)= \)
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Bonus Knowledge
To simplify the expression step-by-step, we start with the division part: First, convert the mixed number \(-2\frac{3}{10}\) into an improper fraction: \(-2 = -\frac{20}{10}\) and adding \(-\frac{3}{10}\) gives us \(-\frac{20}{10} - \frac{3}{10} = -\frac{23}{10}\). Now, we can rewrite the expression as: \[ \left(-\frac{3}{2}\right) \div \left(-\frac{23}{10}\right) \div \left(+\frac{5}{6}\right) - \left(-\frac{1}{2}\right) \] Dividing by a fraction is the same as multiplying by its reciprocal, so we have: \[ \left(-\frac{3}{2}\right) \cdot \left(-\frac{10}{23}\right) \cdot \left(\frac{6}{5}\right) + \frac{1}{2} \] Now, calculate: 1. \(\left(-\frac{3}{2}\right) \cdot \left(-\frac{10}{23}\right) = \frac{30}{46} = \frac{15}{23}\) 2. Now multiplying this by \(\frac{6}{5}\): \(\frac{15}{23} \cdot \frac{6}{5} = \frac{90}{115} = \frac{18}{23}\) So our expression now looks like this: \[ \frac{18}{23} + \frac{1}{2} \] To add the two fractions, convert \(\frac{1}{2}\) to a fraction with a denominator of 23: \(\frac{1}{2} = \frac{23}{46}\) (equivalent to \(\frac{11.5}{23}\)) After finding a common denominator: \(\frac{18}{23} + \frac{11.5}{23} = \frac{29.5}{23}\) Therefore, the final simplified expression is: \[ \frac{29.5}{23} \text{ or } \frac{59}{46} \text{ if expressed in improper fraction form.} \] Thus, the answer can be approximated as \(2.75\) if desired in decimal format, or simply left as \(\frac{29.5}{23}\), depending on context.
