Question

alguém pode me ajudar? ​

Answer 1

2)

a)

$\frac{ \sqrt{ {2}^{2} + {3}^{2} + {6}^{2} } }{3} = \frac{ \sqrt{4 + 9 + 36} }{3} = \frac{ \sqrt{49} }{ 3} = \frac{7}{3} = 2.333$

b)

$\frac{ \sqrt{ {4}^{2} + {9}^{2} + {10}^{2} } }{3} = \frac{ \sqrt{16 + 81 + 100} }{3} = \frac{ \sqrt{197} }{3} = \frac{14.035}{3} = 4.6785$

3)

a)

$\frac{2}{ \frac{1}{2} + \frac{1}{4} } = \frac{2}{ \frac{2 + 1}{4} } = \frac{2}{ \frac{3}{4} } = 2 \times \frac{4}{3} = \frac{8}{3} = 2.666$

b)

$\frac{3}{ \frac{1}{3} + \frac{1}{6} + \frac{1}{9} } = \frac{3}{ \frac{6 + 3 + 2}{18} } = \frac{3}{ \frac{11}{18} } = 3 \times \frac{18}{11} = \frac{54}{11} = 4.91$