A. \(\left( {\frac{1}{2}; - \frac{1}{2};\frac{1}{2}} \right)\)
B. \(\left( {\frac{2}{3};\frac{2}{3};\frac{2}{3}} \right)\)
C. \(\left( {\frac{1}{2};\frac{1}{2};\frac{1}{2}} \right)\)
D. \(\left( { - \frac{1}{2}; - \frac{1}{2}; - \frac{1}{2}} \right)\)
A. Mặt cầu (S) tiếp xúc với (Oxy).
B. Mặt cầu (S) không tiếp xúc với cả 3 mặt phẳng (Oxy ), (Oxz), (Oyz).
C. Mặt cầu (S) tiếp xúc với (Oyz).
D. Mặt cầu (S) tiếp xúc với (Oxz).
A. \({\left( {x - 1} \right)^2} + {\left( {y + 2} \right)^2} + {\left( {z - 3} \right)^2} = 17\)
B. \({\left( {x - 3} \right)^2} + {\left( {y - 1} \right)^2} + {\left( {z - 5} \right)^2} = 17\)
C. \({\left( {x - 5} \right)^2} + {\left( {y - 4} \right)^2} + {\left( {z - 7} \right)^2} = 17\)
D. \({\left( {x - 6} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z - 10} \right)^2} = 17\)
A. \((S):{\left( {x - 5} \right)^2} + {\left( {y - 3} \right)^2} + {\left( {z + 1} \right)^2} = \frac{3}{4}\)
B. \((S):{\left( {x + 1} \right)^2} + {\left( {y - 3} \right)^2} + {\left( {z - 3} \right)^2} = 1\)
C. \((S):{\left( {x - 1} \right)^2} + {\left( {y - 4} \right)^2} + {\left( {z + 7} \right)^2} = 121\)
D. \((S):{\left( {x - 1} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z - 2} \right)^2} = 9\)
A. I(0;0;1), R = 3
B. I(3;-2;1), R = 3
C. I(3;-1;8), R = 4
D. I(1;2;2), R = 3
A. \({\left( {x - 2} \right)^2} + {y^2} + {\left( {z - 3} \right)^2} = \sqrt 3 \)
B. \({\left( {x - 2} \right)^2} + {y^2} + {\left( {z - 3} \right)^2} = 3\)
C. \({\left( {x + 2} \right)^2} + {y^2} + {\left( {z + 3} \right)^2} = 3\)
D. \({\left( {x + 2} \right)^2} + {y^2} + {\left( {z + 3} \right)^2} = \sqrt 3 \)
A. \({\left( {x + 2} \right)^2} + {\left( {y - 1} \right)^2} + {\left( {z + 3} \right)^2} = 5\)
B. \({\left( {x - 2} \right)^2} + {\left( {y + 1} \right)^2} + {\left( {z - 3} \right)^2} = 5\)
C. \({\left( {x - 2} \right)^2} + {\left( {y + 1} \right)^2} + {\left( {z - 3} \right)^2} = 25\)
D. \({\left( {x + 2} \right)^2} + {\left( {y - 1} \right)^2} + {\left( {z + 3} \right)^2} = 25\)
A. (3;3;-3)
B. \(\left( {\frac{3}{2}; - \frac{3}{2};\frac{3}{2}} \right)\)
C. \(\left( {\frac{3}{2};\frac{3}{2};\frac{3}{2}} \right)\)
D. (3;3;3)
A. \({\left( {x + 1} \right)^2} + {\left( {y + 2} \right)^2} + {\left( {z - 3} \right)^2} = 53\)
B. \({\left( {x + 1} \right)^2} + {\left( {y + 2} \right)^2} + {\left( {z + 3} \right)^2} = 53\)
C. \({\left( {x - 1} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z + 3} \right)^2} = 53\)
D. \({\left( {x - 1} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z - 3} \right)^2} = 53\)
A. \({x^2} + {(y - 1)^2} + {(z + 2)^2} = 5\)
B. \({\left( {x + 1} \right)^2} + {y^2} + {\left( {z + 4} \right)^2} = 5\)
C. \({\left( {x + 1} \right)^2} + {y^2} + {\left( {z - 2} \right)^2} = 5\)
D. \({\left( {x - 1} \right)^2} + {y^2} + {\left( {z + 2} \right)^2} = 5\)
A. m = -1 hoặc m = -4
B. m = 0 hoặc m = -4
C. m = -1 hoặc m = 0
D. Cả A, B, C đều sai
A. \({\left( {x - 1} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z + 3} \right)^2} = 4\)
B. \({\left( {x + 3} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z - 2} \right)^2} = 4\)
C. \({\left( {x - 1} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z + 3} \right)^2} = 2\)
D. \({\left( {x + 1} \right)^2} + {\left( {y + 2} \right)^2} + {\left( {z - 3} \right)^2} = 4\)
A. (P) cắt (S)
B. (P) tiếp xúc với (S)
C. (P) không cắt (S)
D. Tâm của mặt cầu (S) nằm trên mặt phẳng (P)
A. m < 9 hoặc m >21
B. -9 < m < 21
C. \( - 9 \le m \le 21\)
D. \(m \le - 9\) hoặc \(m \ge 21\)
A. \({\left( {x + 3} \right)^2} + {\left( {y + 1} \right)^2} + {\left( {z - 3} \right)^2} = \frac{4}{9}\)
B. \({\left( {x - 3} \right)^2} + {\left( {y + 1} \right)^2} + {\left( {z + 3} \right)^2} = \frac{4}{9}\)
C. \({\left( {x - 3} \right)^2} + {\left( {y - 1} \right)^2} + {\left( {z + 3} \right)^2} = \frac{4}{9}\)
D. \({\left( {x + 3} \right)^2} + {\left( {y + 1} \right)^2} + {\left( {z + 3} \right)^2} = \frac{4}{9}\)
A. m = -16
B. m = 16
C. m = 4
D. m = -4
A. \((S):{\left( {x + 2} \right)^2} + {\left( {y + 4} \right)^2} + {\left( {z + 3} \right)^2} = \frac{2}{7}\)
B. \((S):{\left( {x - 2} \right)^2} + {\left( {y - 4} \right)^2} + {\left( {z - 3} \right)^2} = \frac{9}{{14}}\)
C. \((S):{\left( {x - 2} \right)^2} + {\left( {y - 4} \right)^2} + {\left( {z - 3} \right)^2} = \frac{2}{7}\)
D. \((S):{\left( {x + 2} \right)^2} + {\left( {y + 4} \right)^2} + {\left( {z + 3} \right)^2} = \frac{9}{{14}}\)
A. \({\left( {x + 2} \right)^2} + {y^2} + {\left( {z - 3} \right)^2} = 9\)
B. \({\left( {x - 2} \right)^2} + {(y - 1)^2} + {\left( {z - 3} \right)^2} = 9\)
C. \({\left( {x - 2} \right)^2} + {y^2} + {\left( {z - 3} \right)^2} = 9\)
D. \({\left( {x - 2} \right)^2} + {y^2} + {\left( {z + 3} \right)^2} = 9\)
A. -2
B. -4
C. -1
D. -3
A. H( - 3;0; - 2)
B. H(3;0;2)
C. H(1; - 1;0)
D. H( - 1;4;4)
A. \({\left( {x + 1} \right)^2} + {\left( {y - 3} \right)^2} + {\left( {z - 2} \right)^2} = 9\)
B. \({\left( {x + 1} \right)^2} + {\left( {y - 3} \right)^2} + {\left( {z - 2} \right)^2} = 1\)
C. \({\left( {x + 1} \right)^2} + {\left( {y - 3} \right)^2} + {\left( {z - 2} \right)^2} = 4\)
D. \({\left( {x + 5} \right)^2} + {\left( {y + 1} \right)^2} + {z^2} = 9\)
A. S = -4
B. S = -1
C. S = -2
D. S = -3
A. \({\left( {x - 3} \right)^2} + {\left( {y + 2} \right)^2} + {\left( {z + 2} \right)^2} = \sqrt {14} \)
B. \({\left( {x + 3} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z - 2} \right)^2} = \sqrt {14} \)
C. \({\left( {x + 3} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z - 2} \right)^2} = 14\)
D. \({\left( {x - 3} \right)^2} + {\left( {y + 2} \right)^2} + {\left( {z + 2} \right)^2} = 14\)
A. \({x^2} + {y^2} + {z^2} - 2x + 2y - 2z - 10 = 0\)
B. \({x^2} + {y^2} + {z^2} - 4x + 2y - 6z - 2 = 0\)
C. \({x^2} + {y^2} + {z^2} + 4x - 2y + 6z + 2 = 0\)
D. \({x^2} + {y^2} + {z^2} - 2x + 2y - 2z - 2 = 0\)
A. \({(x - 1)^2} + {y^2} + {z^2} = 5\)
B. \({(x - 1)^2} + {y^2} + {z^2} = \sqrt 5 \)
C. \({(x + 1)^2} + {y^2} + {z^2} = 5\)
D. \({(x + 1)^2} + {y^2} + {z^2} = \sqrt 5 \)
A. T = -2
B. T = 1
C. T = -1
D. T = 0
A. x + z + 1 = 0.
B. x + y + 1 = 0.
C. y + z + 3 = 0.
D. x + z - 1 = 0.
A. \(R = \sqrt 6 \)
B. R = 2
C. R = 1
D. \(R = \sqrt 3 \)
A. 3x - y - z = 0
B. 3x + y + z - 6 = 0
C. 3x - y - z + 1 = 0
D. 6x - 2y - 2z - 1 = 0
A. \(D\,(0;3;-1).\)
B. \(D\,(0;-3;-1).\)
C. \(D\,(0;1;-1).\)
D. \(D\,(0;2;-1).\)
A. P = 1
B. \(P=\frac{-1}{2}.\)
C. \(P=\frac{1}{2}.\)
D. P = 2
A. \(D\,(1;2;0).\)
B. \(D\,(0;0;3).\)
C. \(D\,(0;0;-3).\)
D. \(D\,(0;0;2).\)
A. 1
B. \(\frac{9}{7}.\)
C. 9
D. \(\frac{5}{7}.\)
A. 1
B. 2
C. 3
D. 4
A. \({{h}_{D}}=\frac{9\sqrt{2}}{2}.\)
B. \({{h}_{D}}=9.\)
C. \({{h}_{D}}=\frac{9\sqrt{2}}{4}.\)
D. \({{h}_{D}}=9\sqrt{2}.\)
A. \(\sqrt{21}.\)
B. \(\frac{\sqrt{21}}{3}.\)
C. \(\sqrt{42}.\)
D. \(2\sqrt{21}.\)
A. \(7\sqrt{2}.\)
B. 15
C. \(15\sqrt{2}.\)
D. 45
A. \(x=\pm 1.\)
B. \(x=\pm 3.\)
C. \(\left[ \begin{array} {} x=1 \\ {} x=-3 \\ \end{array} \right..\)
D. \(\left[ \begin{array} {} x=3 \\ {} x=1 \\ \end{array} \right..\)
A. x = -1
B. x = 1
C. x = -2
D. x = 2
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