Thực hiện phép tính :
\(a)\,\,\sqrt {20} - 3\sqrt {125} + 5\sqrt {45} \) \(b)\,\,\frac{3}{{\sqrt 3 - \sqrt 2 }} - 2\sqrt {{{\left( {\sqrt 2 - \sqrt 3 } \right)}^2}} - 5\sqrt 2 \)
A.\(\begin{array}{l}a)\,\,\sqrt 5 \\b)\,\,\sqrt 3 \end{array}\)
B.\(\begin{array}{l}a)\,\,2\sqrt 5 \\b)\,\,\sqrt 3 \end{array}\)
C.\(\begin{array}{l}a)\,\,\sqrt 5 \\b)\,\,2\sqrt 3 \end{array}\)
D.\(\begin{array}{l}a)\,\,2\sqrt 5 \\b)\,\,2\sqrt 3 \end{array}\)
\(a)\,\,\sqrt {20} - 3\sqrt {125} + 5\sqrt {45} \) \(b)\,\,\frac{3}{{\sqrt 3 - \sqrt 2 }} - 2\sqrt {{{\left( {\sqrt 2 - \sqrt 3 } \right)}^2}} - 5\sqrt 2 \)
A.\(\begin{array}{l}a)\,\,\sqrt 5 \\b)\,\,\sqrt 3 \end{array}\)
B.\(\begin{array}{l}a)\,\,2\sqrt 5 \\b)\,\,\sqrt 3 \end{array}\)
C.\(\begin{array}{l}a)\,\,\sqrt 5 \\b)\,\,2\sqrt 3 \end{array}\)
D.\(\begin{array}{l}a)\,\,2\sqrt 5 \\b)\,\,2\sqrt 3 \end{array}\)
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Hóa Học lớp 12
