{"save":1,"level":1,"time":"45","total":20,"point":5,"segment":[{"id":"158","test_id":"206","question":"<p>Trong m\u1eb7t ph\u1eb3ng&nbsp;<span class=\"math-tex\">$Oxy$<\/span>, cho&nbsp;<span class=\"math-tex\">$\\left( C \\right):{\\left( {x - 2} \\right)^2} + {\\left( {y + 4} \\right)^2} = 8$<\/span>. T&igrave;m \u1ea3nh c\u1ee7a&nbsp;<span class=\"math-tex\">$(C)$<\/span>&nbsp;qua&nbsp;&nbsp;<span class=\"math-tex\">${V_{\\left( {O,\\dfrac{3}{2}} \\right)}}$<\/span><\/p>","options":["A.&nbsp;<span class=\"math-tex\">${\\left( {x - 6} \\right)^2} + {\\left( {y + 12} \\right)^2} = 8$<\/span>","B.&nbsp;<span class=\"math-tex\">${\\left( {x + 3} \\right)^2} + {\\left( {y - 6} \\right)^2} = 8$<\/span>","C.&nbsp;<span class=\"math-tex\">${\\left( {x - 3} \\right)^2} + {\\left( {y + 12} \\right)^2} = 18$<\/span>","D.&nbsp;<span class=\"math-tex\">${\\left( {x - 3} \\right)^2} + {\\left( {y + 6} \\right)^2} = 18$<\/span>"],"correct":"4","answer":"<p>\u0110\u01b0\u1eddng tr&ograve;n&nbsp;<span class=\"math-tex\">$(C)$<\/span>&nbsp;c&oacute;:&nbsp;<span class=\"math-tex\">$I(2;-4), R=2\\sqrt 2$<\/span><\/p><p>V\u1edbi ph&eacute;p v\u1ecb t\u1ef1&nbsp;<span class=\"math-tex\">${V_{\\left( {O,\\dfrac{3}{2}} \\right)}}$<\/span>&nbsp;s\u1ebd bi\u1ebfn&nbsp;<span class=\"math-tex\">$I$<\/span>&nbsp;th&agrave;nh&nbsp;<span class=\"math-tex\">$I^{\\prime}(x^{\\prime};y^{\\prime})$<\/span>&nbsp;v&agrave;&nbsp;<span class=\"math-tex\">$R^{\\prime}=\\dfrac{3}2R=3\\sqrt 2$<\/span>&nbsp;<\/p><p>Khi \u0111&oacute;:&nbsp;<span class=\"math-tex\">$\\left\\{ \\begin{array}{l} x^{\\prime}=\\dfrac{3}{2}x = 3\\\\ y^{\\prime} = \\dfrac{3}{2}y = - 6\\end{array} \\right.$<\/span><span class=\"math-tex\">$\\Rightarrow I^{\\prime}(3; - 6)$<\/span><\/p><p>&nbsp;<\/p>","type":"choose","user_id":"88","test":"2","date":"2020-03-12 10:45:35"},{"id":"159","test_id":"206","question":"<p>Trong m\u1eb7t ph\u1eb3ng&nbsp;<span class=\"math-tex\">$Oxy$<\/span>, t&igrave;m \u1ea3nh c\u1ee7a \u0111i\u1ec3m&nbsp;<span class=\"math-tex\">$M(-1;-2)$<\/span>&nbsp;qua ph&eacute;p quay&nbsp;<span class=\"math-tex\">${Q_{\\left( {O,{{180}^0}} \\right)}}$<\/span><\/p>","options":["A.&nbsp;<span class=\"math-tex\">$M^{\\prime}(1;2)$<\/span>","B.&nbsp;<span class=\"math-tex\">$M^{\\prime}(2;1)$<\/span>","C.&nbsp;<span class=\"math-tex\">$M^{\\prime}(-1;2)$<\/span>","D.&nbsp;<span class=\"math-tex\">$M^{\\prime}(2;-1)$<\/span>"],"correct":"1","answer":"<p>G\u1ecdi&nbsp;<span class=\"math-tex\">$M^{\\prime}(x^{\\prime};y^{\\prime})$<\/span>&nbsp;l&agrave; \u1ea3nh c\u1ee7a&nbsp;\u0111i\u1ec3m&nbsp;<span class=\"math-tex\">$M(-1;-2)$<\/span>&nbsp;qua ph&eacute;p quay&nbsp;<span class=\"math-tex\">${Q_{\\left( {O,{{180}^0}} \\right)}}$<\/span><\/p><p>Khi \u0111&oacute;:&nbsp;<span class=\"math-tex\">$M^{\\prime}(x^{\\prime};y^{\\prime})$<\/span>&nbsp;s\u1ebd \u0111\u1ed1i x\u1ee9ng v\u1edbi&nbsp;<span class=\"math-tex\">$M(-1;-2)$<\/span>&nbsp;qua t&acirc;m&nbsp;<span class=\"math-tex\">$O(0;0)$<\/span><\/p><p>Suy ra :&nbsp;<span class=\"math-tex\">$M\u200b\u200b^{\\prime}(1;2)$<\/span><\/p>","type":"choose","user_id":"88","test":"0","date":"2020-03-12 10:47:10"}]}