{"common":{"save":0,"post_id":"7585","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5572","post_id":"7585","mon_id":"1159285","chapter_id":"1159392","question":"<p>Trong không gian Oxyz, cho \u0111i\u1ec3m A(3; –1; 1). Hình chi\u1ebfu vuông góc c\u1ee7a \u0111i\u1ec3m A trên m\u1eb7t ph\u1eb3ng (Oyz) là \u0111i\u1ec3m<\/p>","options":["<strong>A.<\/strong> (3; 0; 0)","<strong>B.<\/strong> (0; –1; 1)","<strong>C.<\/strong> (0; –1; 0)","<strong>D.<\/strong> (0; 0; 1)"],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> (0; –1; 1)<\/span><\/p><p>Khi chi\u1ebfu vuông góc m\u1ed9t \u0111i\u1ec3m trong không gian lên m\u1eb7t ph\u1eb3ng (Oyz), ta gi\u1eef l\u1ea1i các thành ph\u1ea7n tung \u0111\u1ed9 và cao \u0111\u1ed9 nên hình chi\u1ebfu c\u1ee7a A(3; –1; 1) lên (Oyz) là \u0111i\u1ec3m N(0; –1; 1).<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-09-01 02:08:52","option_type":"txt","len":2},{"id":"5575","post_id":"7585","mon_id":"1159285","chapter_id":"1159392","question":"<p>Trong không gian v\u1edbi h\u1ec7 t\u1ecda \u0111\u1ed9 Oxyz, \u0111i\u1ec3m nào sau \u0111ây n\u1eb1m trên m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 (Oyz)?<\/p>","options":["<strong>A.<\/strong> M(3; 4; 0)","<strong>B.<\/strong> P(–2; 0; 3)","<strong>C.<\/strong> Q(2; 0; 0)","<strong>D.<\/strong> N(0; 4; –1)"],"correct":"4","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> N(0; 4; –1)<\/span><\/p><p>M\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 (Oyz) có ph\u01b0\u01a1ng trình là x = 0 ⇒ N(0; 4; –1) ∈ (Oyz).<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-09-01 02:26:28","option_type":"txt","len":2},{"id":"5576","post_id":"7585","mon_id":"1159285","chapter_id":"1159392","question":"<p>Trong không gian Oxyz, hình chi\u1ebfu vuông góc c\u1ee7a \u0111i\u1ec3m M(2; 1; –1) trên m\u1eb7t ph\u1eb3ng (Ozx) có t\u1ecda \u0111\u1ed9 là<\/p>","options":["<strong>A.<\/strong> (0; 1; 0)","<strong>B.<\/strong> (2; 1; 0)","<strong>C.<\/strong> (0; 1; –1)","<strong>D.<\/strong> (2; 0; –1)"],"correct":"4","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> (2; 0; –1)<\/span><\/p><p>Hình chi\u1ebfu c\u1ee7a M(2; 1; –1) lên m\u1eb7t ph\u1eb3ng (Ozx) là \u0111i\u1ec3m có t\u1ecda \u0111\u1ed9 (2; 0; –1).<\/p>","type":"choose","extra_type":"shape1","user_id":"131","test":"0","date":"2024-09-01 02:29:38","option_type":"txt","len":0}]}
