Question

me ajudem nessa por favor é pra hj!!!!​

Answer 1

a.

$(8 - {0.7}^{2} ) \times \sqrt{ \frac{49}{25} } \\ (8 - 0.49) \times \frac{ \sqrt{49} }{ \sqrt{25} } \\ 7.51 \times \frac{7}{5} \\ \frac{52.57}{5}$

b.

$\frac{2}{3} \div \frac{8}{9} \times \sqrt{0.25} \\ \frac{2}{3} \times \frac{9}{8} \times 0.5 \\ \frac{18}{24} \times 0.5 \\ \frac{9}{24}$

c.

$\sqrt{ \frac{9}{16} } \times \frac{4}{5} + {0.2}^{2} \\ \frac{ \sqrt{9} }{ \sqrt{16} } \times \frac{4}{5} + 0.04 \\ \frac{3}{4} \times \frac{4}{5} + 0.04 \\ \frac{12}{20} + 0.04 \\ \frac{12.8}{20} = \frac{3.2}{5}$

d.

$5.1 - {( \frac{3}{5} )}^{3} \div (2 - \sqrt{144} ) \\ 5.1 - ( \frac{ {3}^{3} }{ {5}^{3} } ) \div (2 - 12) \\ 5.1 - \frac{27}{125} \div ( - 10) \\ \frac{610.5}{125} \div ( - 10) \\ \frac{610.5}{125} \times \frac{1}{ - 10} \\ \frac{610.5}{ - 1250 } = \frac{122.1}{ - 250}$