Question

Determine o valor das expressões 2¯¹+6.(⅔)¯²-(-⅓)¯¹

Answer 1

${2}^{ - 1} + 6( \frac{2}{3} ) {}^{ - 2} - {( - \frac{1}{3}) }^{ - 1} \\ \frac{1}{2} + 6 {( \frac{3}{2} )}^{2} - ( - 3) \\ \frac{1}{2} + 6 \times \frac{9}{4} + 3 \\ \frac{1}{2} + \frac{54}{4} + 3 \\ \frac{4 + 108 + 24}{8} \\ \frac{136}{8} = 17$