{"common":{"save":0,"post_id":"7587","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5594","post_id":"7587","mon_id":"1159285","chapter_id":"1159392","question":"<p>Trong kh&ocirc;ng gian t\u1ecda \u0111\u1ed9 Oxyz&nbsp;cho \u0111i\u1ec3m <span class=\"math-tex\">$M(1;2;-\\sqrt{3})$<\/span>.&nbsp;T&igrave;m \u0111i\u1ec3m M&#39; &isin; Oz sao cho \u0111\u1ed9 d&agrave;i \u0111o\u1ea1n th\u1eb3ng MM&#39; ng\u1eafn nh\u1ea5t.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$M^\\prime(1;0;-\\sqrt{3})$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$M^\\prime(0; 2;-\\sqrt{3})$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$M^\\prime(0;0;-\\sqrt{3})$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$M^\\prime(0;0;\\sqrt{3})$<\/span>"],"correct":"3","level":"3","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$M^\\prime(0;0;-\\sqrt{3})$<\/span><\/span><\/p><p>MM&#39; ng\u1eafn nh\u1ea5t khi \u0111i\u1ec3m&nbsp;M&prime; l&agrave; h&igrave;nh chi\u1ebfu c\u1ee7a&nbsp;\u0111i\u1ec3m&nbsp;M&nbsp;tr&ecirc;n tr\u1ee5c&nbsp;Oz<\/p><p>&rArr; <span style=\"color:#16a085;\"><span class=\"math-tex\">$M^\\prime(0;0;-\\sqrt{3})$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-09-01 04:00:18","option_type":"math","len":0},{"id":"5595","post_id":"7587","mon_id":"1159285","chapter_id":"1159392","question":"<p>Trong kh&ocirc;ng gian t\u1ecda \u0111\u1ed9 Oxyz&nbsp;cho \u0111i\u1ec3m A(1; 1; 2). T&igrave;m&nbsp;\u0111i\u1ec3m A&#39;&nbsp;&isin; (Oxy) sao cho \u0111\u1ed9 d&agrave;i \u0111o\u1ea1n th\u1eb3ng AA&#39;&nbsp;ng\u1eafn nh\u1ea5t.<\/p>","options":["<strong>A.<\/strong> A&#39;(&ndash;1; 1; 0)","<strong>B.<\/strong> A&#39;(1; 1; 0)","<strong>C.<\/strong> A&#39;(2; 2; 0)","<strong>D.<\/strong> A&#39;(2; &ndash;1; 2)"],"correct":"2","level":"3","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;A&#39;(1; 1; 0)<\/span><\/p><p>AA&#39;&nbsp;ng\u1eafn nh\u1ea5t khi \u0111i\u1ec3m&nbsp;&nbsp;A&#39; l&agrave; h&igrave;nh chi\u1ebfu \u0111i\u1ec3m&nbsp;A&nbsp;tr&ecirc;n m\u1eb7t&nbsp;ph\u1eb3ng&nbsp;(Oxy)<\/p><p>&rArr; A&prime;(1;1;0)<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-09-01 04:03:26","option_type":"txt","len":2},{"id":"5597","post_id":"7587","mon_id":"1159285","chapter_id":"1159392","question":"<p>Trong kh&ocirc;ng gian t\u1ecda \u0111\u1ed9 Oxyz cho \u0111i\u1ec3m&nbsp;<span class=\"math-tex\">$M(1;1-\\sqrt{2};2+\\sqrt{5})$<\/span>. T&igrave;m \u0111i\u1ec3m M&#39; &isin; (Oxz)&nbsp;sao cho \u0111\u1ed9 d&agrave;i \u0111o\u1ea1n&nbsp;th\u1eb3ng MM&#39; ng\u1eafn nh\u1ea5t.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$M^\\prime(1;1+\\sqrt{2};2-\\sqrt{5})$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$M^\\prime(1;1-\\sqrt{2};0)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$M^\\prime(0;1-\\sqrt{2};2+\\sqrt{5})$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$M^\\prime(1;0;2+\\sqrt{5})$<\/span>"],"correct":"4","level":"3","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;<span class=\"math-tex\">$M^\\prime(1;0;2+\\sqrt{5})$<\/span><\/span><\/p><p>MM&#39; ng\u1eafn nh\u1ea5t khi \u0111i\u1ec3m&nbsp;M&prime;&nbsp;l&agrave; h&igrave;nh chi\u1ebfu \u0111i\u1ec3m&nbsp;M&nbsp;tr&ecirc;n m\u1eb7t&nbsp;ph\u1eb3ng&nbsp;(Oxz).<\/p><p>Suy ra&nbsp;<span style=\"color:#16a085;\"><span class=\"math-tex\">$M^\\prime(1;0;2+\\sqrt{5})$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-09-01 04:07:52","option_type":"math","len":0}]}