123+342=465.

dap an la 465

4367 * 30 =131010 nha e

4367 x 30 = 

TL :

4367 x 30 = 131010

HT

-2-2 căn 10 nha bn

\(\frac{5\sqrt{2}-2\sqrt{5}}{\sqrt{5}-\sqrt{2}}+\frac{6}{2-\sqrt{10}}-\frac{20}{\sqrt{10}}\)

\(=\frac{\sqrt{10}\left(\sqrt{5}-\sqrt{2}\right)}{\sqrt{5}-\sqrt{2}}+\frac{6\left(2+\sqrt{10}\right)}{\left(2-\sqrt{10}\right)\left(2+\sqrt{10}\right)}-\frac{20\sqrt{10}}{10}\)

\(=\sqrt{10}+\frac{6\left(2+\sqrt{10}\right)}{2^2-\left(\sqrt{10}\right)^2}-2\sqrt{10}\)

\(=-\sqrt{10}+\frac{6\left(2+\sqrt{10}\right)}{4-10}\)

\(=-\sqrt{10}-\frac{6\left(2+\sqrt{10}\right)}{6}\)

\(=-\sqrt{10}-2-\sqrt{10}\)

\(=-2-2\sqrt{10}\)

ta có : x/y=5/8  => x/5=y/8   Áp dụng tính chất dãy tỉ số bằng nhau, ta có:  x/5=y/8=x+y/5+8=27/13      =>x/5=27/13  =>x=27/13.5=135/13   ;  =>y=216/13

...retghjmhtredghbewsrgn

= 458 122 bn nhé '-'

458 122 nha bn

Vì  \(\frac{x}{y}=\frac{5}{8}\) nên \(\frac{x}{5}=\frac{y}{8}\), mà \(x+y=27\)

\(\Rightarrow\frac{x}{5}=\frac{y}{8}=\frac{x+y}{5+8}=\frac{27}{13}\)

\(\Rightarrow\frac{x}{5}=\frac{27}{13}\Rightarrow x=\frac{135}{13}\)

\(\Rightarrow\frac{y}{8}=\frac{27}{13}\Rightarrow y=\frac{216}{13}\)

rttfytdfddgggdsxdgfdfghhgdghgttredtres

DWETETTETEETETSTDGUYEGDVBQWEGSRCDVGBSGEHDY3WNB3TEGHFGERTFGESFBESTFEFUEJWKREUFUEWJKQDXWQGKDQWKEG32EG2E2E2@?SIUWESH2E3YEU2DWUHYDJWASJAUDSUAEJ BDTEW87DEWG6FD6EWTYASDUG7WQHG

=0 hoi ngu the

=0 kooooooooooooooooooo