Question

4. calcule (- 1/4 + 7/5 - 1,5) - (1/3 - 2/5)​

Answer 1

Vamos aos cálculos:

$(- \frac{ 1 }{ 4 } + \frac{ 7 }{ 5 } -1.5)-( \frac{ 1 }{ 3 } - \frac{ 2 }{ 5 } ) \\ \\ -\frac{5}{20}+\frac{28}{20}-1.5-\left(\frac{1}{3}-\frac{2}{5}\right) \\ \\ \frac{-5+28}{20}-1.5-\left(\frac{1}{3}-\frac{2}{5}\right) \\ \\ \frac{23}{20}-1.5-\left(\frac{1}{3}-\frac{2}{5}\right) \\ \\ \frac{23}{20}-\frac{3}{2}-\left(\frac{1}{3}-\frac{2}{5}\right) \\ \\ \frac{23}{20}-\frac{30}{20}-\left(\frac{1}{3}-\frac{2}{5}\right) \\ \\ \frac{23-30}{20}-\left(\frac{1}{3}-\frac{2}{5}\right) \\ \\ -\frac{7}{20}-\left(\frac{1}{3}-\frac{2}{5}\right) \\ \\ -\frac{7}{20}-\frac{5-6}{15} \\ \\ -\frac{7}{20}-\left(-\frac{1}{15}\right) \\ \\ -\frac{7}{20}+\frac{1}{15} \\ \\ -\frac{21}{60}+\frac{4}{60} \\ \\ \frac{-21+4}{60} \\ \\ -\frac{17}{60} \\ \\ \\ -\frac{17}{60}\ = -0.28333....$

Espero te ajudando!!