-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

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= 458 122 bn nhé '-'

458 122 nha bn

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

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

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

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

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ca sĩ, susi, vật nuôi, thỏ, chó, mèo, vàng chanh, đỏ dễ ẹc đố j khó hơn đi

=0 hoi ngu the

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12:6=2 nha

7:6=1.166 666 666 67 nha

=1.111 1111e+16 nha

79:8=9.875 nha

92:9=10.222 222 222 2 nha