{"common":{"save":0,"post_id":"6704","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7300","mon_id":"1158767","chapter_id":"1158999","post_id":"6704","question":"<p>Trong m\u1eb7t ph\u1eb3ng Oxy, t&igrave;m t\u1ecda \u0111\u1ed9 t&acirc;m I c\u1ee7a \u0111\u01b0\u1eddng tr&ograve;n \u0111i qua ba \u0111i\u1ec3m A(0; 4), B(2; 4) v&agrave; C(2; 0).<\/p>","options":["<strong>A.<\/strong> I(1; 1)","<strong>B.<\/strong> I(0; 0)","<strong>C.<\/strong> I(1; 2)","<strong>D.<\/strong> I(1; 0)"],"correct":"3","level":"3","hint":"","answer":"<p>Gi\u1ea3 s\u1eed ph\u01b0\u01a1ng tr&igrave;nh \u0111\u01b0\u1eddng tr&ograve;n \u0111i qua 3 \u0111i\u1ec3m A, B, C c&oacute; d\u1ea1ng l&agrave;<\/p><p><span class=\"math-tex\">$(C):x^2+y^2+2ax+2by+c=0$<\/span><\/p><p>Thay t\u1ecda \u0111\u1ed9 c\u1ee7a ba \u0111i\u1ec3m A(0; 4), B(2; 4) v&agrave; C(2; 0) v&agrave;o, ta \u0111\u01b0\u1ee3c:<\/p><p><span class=\"math-tex\">$\\begin{cases}8b+c=-16\\\\4a+8b+c=-20\\\\4a+c=-4\\end{cases}$<\/span>&nbsp;<span class=\"math-tex\">$\\Leftrightarrow \\begin{cases}a=-1\\\\b=-2\\\\c=0\\end{cases}$<\/span>&nbsp;suy ra&nbsp;<span class=\"math-tex\">$(C):x^2+y^2-2x-4y=0$<\/span><\/p><p>V\u1eady (C) c&oacute; t&acirc;m l&agrave; I(1; 2).<\/p><p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong> I(1; 2)<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-09-21 01:53:12","option_type":"txt","len":0},{"id":"7302","mon_id":"1158767","chapter_id":"1158999","post_id":"6704","question":"<p>Cho \u0111\u01b0\u1eddng tr&ograve;n&nbsp;<span class=\"math-tex\">$(C):(x+1)^2+(y-2)^2=4$<\/span> v&agrave; \u0111\u01b0\u1eddng th\u1eb3ng <span class=\"math-tex\">$d:4x+3y+3=0$<\/span>. G\u1ecdi A, B l&agrave; giao \u0111i\u1ec3m c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng d v\u1edbi \u0111\u01b0\u1eddng tr&ograve;n (C). T&iacute;nh \u0111\u1ed9 d&agrave;i AB.<\/p>","options":["<strong>A.<\/strong> 2","<strong>B.<\/strong> <span class=\"math-tex\">$\\sqrt{3}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{2}{\\sqrt{3}}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$2\\sqrt{3}$<\/span>"],"correct":"4","level":"3","hint":"","answer":"<p><span class=\"svgedit\"><svg height=\"174\" width=\"271\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g>&lt;title&gt;&lt;\/title><rect fill=\"#fff\" height=\"176\" id=\"canvas_background\" width=\"273\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g>&lt;title&gt;&lt;\/title><image height=\"174\" id=\"svg_1\" width=\"271\" x=\"0.5\" 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\" y=\"0\"><\/image> <\/g> <\/svg><\/span><\/p><p>\u0110\u01b0\u1eddng tr&ograve;n&nbsp;<span class=\"math-tex\">$(C):(x+1)^2+(y-2)^2=4$<\/span>&nbsp;c&oacute; t&acirc;m&nbsp;<span class=\"math-tex\">$I(-1;2)$<\/span>&nbsp;v&agrave; b&aacute;n k&iacute;nh R = 2.<\/p><p>G\u1ecdi H&nbsp;l&agrave; trung \u0111i\u1ec3m c\u1ee7a \u0111o\u1ea1n AB. Khi \u0111&oacute;&nbsp;<\/p><p><span class=\"math-tex\">$IH=d(I;d)=\\dfrac{|4.(-1)+3.2+3|}{\\sqrt{4^2+3^2}}=1$<\/span><\/p><p>V\u1eady AB = 2 . AH = 2 .&nbsp;<span class=\"math-tex\">$\\sqrt{IA^2-IH^2}=\\sqrt{2^2-1^2}$<\/span> =&nbsp;<span class=\"math-tex\">$2\\sqrt{3}$<\/span><\/p><p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong> <span class=\"math-tex\">$2\\sqrt{3}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-09-21 02:01:27","option_type":"math","len":0},{"id":"7304","mon_id":"1158767","chapter_id":"1158999","post_id":"6704","question":"<p>Trong m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 Oxy, cho elip <span class=\"math-tex\">$\\dfrac{x^2}{25}+\\dfrac{y^2}{9}=1$<\/span>. Ti&ecirc;u c\u1ef1 c\u1ee7a (E) l&agrave;:<\/p>","options":["<strong>A.<\/strong> 8","<strong>B.<\/strong> 16","<strong>C.<\/strong> 4","<strong>D.<\/strong> 10"],"correct":"1","level":"3","hint":"","answer":"<p>Ph\u01b0\u01a1ng tr&igrave;nh ch&iacute;nh t\u1eafc c\u1ee7a elip c&oacute; d\u1ea1ng&nbsp;<span class=\"math-tex\">$\\dfrac{x^2}{a^2}+\\dfrac{y^2}{b^2}=1(a&gt;0,b&gt;0)$<\/span><\/p><p>Do \u0111&oacute; elip (E) c&oacute; a = 5 v&agrave; b = 3, suy ra c =&nbsp;<span class=\"math-tex\">$\\sqrt{a^2-b^2}=\\sqrt{5^2-3^2}$<\/span> = 4.<\/p><p>V\u1eady ti&ecirc;u c\u1ef1 c\u1ee7a elip l&agrave; 2 . c = 2 . 4 = 8<\/p><p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong> 8<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-09-21 02:06:24","option_type":"txt","len":0}]}