Toán Lớp 9: (5 căn 1/5+1/2 căn 20-5/4 căn( 4/5 +căn 5)):2 căn 5
giúp mk vs 🙁
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Toán Lớp 9: (5 căn 1/5+1/2 căn 20-5/4 căn( 4/5 +căn 5)):2 căn 5
giúp mk vs 🙁
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\left( {5\sqrt {\dfrac{1}{5}} + \dfrac{1}{2}\sqrt {20} – \dfrac{5}{4}\sqrt {\dfrac{4}{5}} + \sqrt 5 } \right):2\sqrt 5 \\
= \left( {\sqrt 5 + \dfrac{1}{2}.2\sqrt 5 – \dfrac{5}{4}.\dfrac{{2\sqrt 5 }}{5} + \sqrt 5 } \right):2\sqrt 5 \\
= \left( {\sqrt 5 + \sqrt 5 – \dfrac{1}{2}\sqrt 5 + \sqrt 5 } \right):2\sqrt 5 \\
= \dfrac{{5\sqrt 5 }}{2}:2\sqrt 5 \\
= \dfrac{5}{4}
\end{array}$