\(\sqrt {21 + 8\sqrt 5 } + \sqrt {21 – 8\sqrt 5 } \) A \( 2\sqrt 5\) B \(-2 \sqrt 5\) C \(0\) D \(8\)
by \(\sqrt {21 + 8\sqrt 5 } + \sqrt {21 – 8\sqrt 5 } \) A \( 2\sqrt 5\) B \(-2 \sqrt 5\) C \(0\) D …
Thẻ: Toán lớp 9
\(3\sqrt {18} – \sqrt {32} + 4\sqrt 2 + \sqrt {162} \) A \(9\sqrt 2\) B \(18\sqrt 2\) C \(18\) D \(9\)
\(3\sqrt {18} – \sqrt {32} + 4\sqrt 2 + \sqrt {162} \) A \(9\sqrt 2\) B \(18\sqrt 2\) C \(18\) D \(9\) Hướng dẫn Chọn …
\(D = \left( {4 – \sqrt {15} } \right){\left( {\sqrt {2 – \sqrt 3 } + \sqrt {3 + \sqrt 5 } } \right)^2}\) A \(D = 0\) B \(D = 1\) C \(D = -1\) D \(D = 2\)
\(D = \left( {4 – \sqrt {15} } \right){\left( {\sqrt {2 – \sqrt 3 } + \sqrt {3 + \sqrt 5 } } \right)^2}\) A …
\(2\sqrt {48} – 4\sqrt {27} + \sqrt {75} + \sqrt {12} \) A \(3\sqrt 3 \) B \(\sqrt 3 \) C \(-3\sqrt 3 \) D \(-\sqrt 3 \)
\(2\sqrt {48} – 4\sqrt {27} + \sqrt {75} + \sqrt {12} \) A \(3\sqrt 3 \) B \(\sqrt 3 \) C \(-3\sqrt 3 \) D …
\(C = \frac{{\sqrt {14} + \sqrt 7 }}{{\sqrt 2 + 1}} – \sqrt 7 \) A \(C = 0\) B \(C = -1\) C \(C = 1\) D \(C = 2\)
\(C = \frac{{\sqrt {14} + \sqrt 7 }}{{\sqrt 2 + 1}} – \sqrt 7 \) A \(C = 0\) B \(C = -1\) C \(C …
\(A = 3\sqrt {32} – 6\sqrt 2 – \sqrt {50} \) A \(A = \sqrt 5 \) B \(A = \sqrt 3 \) C \(A = \sqrt 7 \) D \(A = \sqrt 2 \)
\(A = 3\sqrt {32} – 6\sqrt 2 – \sqrt {50} \) A \(A = \sqrt 5 \) B \(A = \sqrt 3 \) C \(A …
\(B = \sqrt {{{\left( {5 + \sqrt 3 } \right)}^2}} + \sqrt {{{\left( {2 – \sqrt 3 } \right)}^2}} \) A \(B = 5\) B \(B = 7\) C \(B = 6\) D \(B = 8\)
\(B = \sqrt {{{\left( {5 + \sqrt 3 } \right)}^2}} + \sqrt {{{\left( {2 – \sqrt 3 } \right)}^2}} \) A \(B = 5\) B …
\(\sqrt {{{\left( {2\sqrt 5 – 5} \right)}^2}} + \sqrt {24 – 8\sqrt 5 } \) A \(\sqrt 5 \) B \(2\) C \(3\sqrt 5 \) D \(3\)
\(\sqrt {{{\left( {2\sqrt 5 – 5} \right)}^2}} + \sqrt {24 – 8\sqrt 5 } \) A \(\sqrt 5 \) B \(2\) C \(3\sqrt 5 \) …
\(4\sqrt {12} – 15\sqrt {\frac{1}{3}} – \frac{{9 – \sqrt 3 }}{{\sqrt 3 }}\) A \(1\) B \(2\) C \(3\) D \(4\)
\(4\sqrt {12} – 15\sqrt {\frac{1}{3}} – \frac{{9 – \sqrt 3 }}{{\sqrt 3 }}\) A \(1\) B \(2\) C \(3\) D \(4\) Hướng dẫn Chọn đáp …
\(\sqrt {{{\left( {2 – \sqrt 5 } \right)}^2}} – \sqrt {\frac{8}{{7 – 3\sqrt 5 }}} \). A \(- 3\) B \(- 4\) C \(- 5\) D \(- 6\)
\(\sqrt {{{\left( {2 – \sqrt 5 } \right)}^2}} – \sqrt {\frac{8}{{7 – 3\sqrt 5 }}} \). A \(- 3\) B \(- 4\) C \(- 5\) …