Question

quanto que e 21 dividido por 2 raiz de 21

Answer 1

Vamos lá ..

$\frac{21}{2 \sqrt{21} } = \frac{21}{2 \sqrt{21} } . \frac{ \sqrt{21} }{ \sqrt{21} }$

$\frac{21}{2 \sqrt{21} } = \frac{21 \sqrt{21} }{ 2\sqrt{21}. \sqrt{21} }$

$\frac{21}{2 \sqrt{21} } = \frac{21 \sqrt{21} }{2.21}$

$\frac{21}{2 \sqrt{21} } = \frac{ \sqrt{21} }{2}$

Answer 2

21 / 2√21 = 

21 / 2√21 x 2√21 / 2√21 = 

42√21 / 4 x (√21)² =

42√21 / 4 x 21 = 

42√21 / 84 = 

1√21 / 2 =

√21 / 2

bons estudos..