Question

pfvr me ajudem nessa 3 perguntas , resposta com calculo pfvr

Answer 1

1)a) $\frac{3}{ \sqrt{5} } = \frac{3 \sqrt{5} }{5}$
b)$\frac{7}{2 \sqrt{7} } = \frac{ \sqrt{7} }{2}$
c)$\frac{6}{5 \sqrt{3} } = \frac{6 \sqrt{3} }{15} = \frac{2 \sqrt{3} }{5}$
d)$\frac{3}{ \sqrt{10} + \sqrt{3} } = \frac{3( \sqrt{10}-3 \sqrt{3}) }{7} = \frac{3 \sqrt{10}-3 \sqrt{3} }{7}$
e)$\frac{5}{ \sqrt{17}+4 } = 5( \sqrt{17}-4) = 5 \sqrt{17} -20$

2)$\frac{4}{6} = \frac{8}{x}$
$4x=48$
$x=12$ < NP

3)$\frac{x}{6} +x= \frac{20}{28}$

28x=20(6+x)
28x=120+20x
28x-20x=120
8x=120
x=120/8
x=15

$\frac{20}{28} = \frac{25}{y}$

20y=700
y=700/20
y=35

x=15 e y=35

Espero ter ajudado!