{"common":{"save":0,"post_id":"7990","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"10673","post_id":"7990","mon_id":"1159278","chapter_id":"1159334","question":"<p>G\u1ecdi <span class=\"math-tex\">$\\ell,h,r$<\/span> l\u1ea7n l\u01b0\u1ee3t l&agrave; \u0111\u1ed9 d&agrave;i \u0111\u01b0\u1eddng sinh, chi\u1ec1u cao v&agrave;&nbsp;b&aacute;n k&iacute;nh c\u1ee7a h&igrave;nh tr\u1ee5 (T). Th\u1ec3 t&iacute;ch V c\u1ee7a h&igrave;nh tr\u1ee5 (T) l&agrave;<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$V=4\\pi r^3$<\/span>.","<strong>B.<\/strong> <span class=\"math-tex\">$V=\\dfrac{1}{3}\\pi r^2\\ell$<\/span>.","<strong>C.<\/strong> <span class=\"math-tex\">$V=\\pi r^2h$<\/span>.","<strong>D.<\/strong> <span class=\"math-tex\">$V=\\dfrac{4}{3}\\pi rh$<\/span>."],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$V=\\pi r^2h$<\/span>.<\/span><\/p><p>Th\u1ec3 t&iacute;ch V c\u1ee7a h&igrave;nh tr\u1ee5 (T) l&agrave;&nbsp;<span style=\"color:#16a085;\"><span class=\"math-tex\">$V=\\pi r^2h$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-04-01 08:22:07","option_type":"math","len":0},{"id":"10675","post_id":"7990","mon_id":"1159278","chapter_id":"1159334","question":"<p>G\u1ecdi <span class=\"math-tex\">$\\ell,h,r$<\/span> l\u1ea7n l\u01b0\u1ee3t l&agrave; \u0111\u1ed9 d&agrave;i \u0111\u01b0\u1eddng sinh, chi\u1ec1u cao v&agrave;&nbsp;b&aacute;n k&iacute;nh c\u1ee7a h&igrave;nh tr\u1ee5 (T).&nbsp;Di\u1ec7n t&iacute;ch xung quanh c\u1ee7a h&igrave;nh tr\u1ee5&nbsp;(T) l&agrave;<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$S_{xq}=2\\pi r\\ell$<\/span>.","<strong>B.<\/strong> <span class=\"math-tex\">$S_{xq}=\\pi rh$<\/span>.","<strong>C.<\/strong> <span class=\"math-tex\">$S_{xq}=\\pi r\\ell$<\/span>.","<strong>D.<\/strong> <span class=\"math-tex\">$S_{xq}=\\pi r^2h$<\/span>."],"correct":"1","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$S_{xq}=2\\pi r\\ell$<\/span>.<\/span><\/p><p>Di\u1ec7n t&iacute;ch xung quanh c\u1ee7a h&igrave;nh tr\u1ee5 (T) l&agrave;&nbsp;<span class=\"math-tex\">$S_{xq}=2\\pi rh=2\\pi r\\ell$<\/span>&nbsp;(v&igrave; trong h&igrave;nh tr\u1ee5 c&aacute;c \u0111\u01b0\u1eddng sinh b\u1eb1ng nhau v&agrave; b\u1eb1ng chi\u1ec1u cao).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-04-01 08:28:58","option_type":"math","len":0},{"id":"10677","post_id":"7990","mon_id":"1159278","chapter_id":"1159334","question":"<p>G\u1ecdi <span class=\"math-tex\">$\\ell,h,r$<\/span> l\u1ea7n l\u01b0\u1ee3t l&agrave; \u0111\u1ed9 d&agrave;i \u0111\u01b0\u1eddng sinh, chi\u1ec1u cao v&agrave;&nbsp;b&aacute;n k&iacute;nh c\u1ee7a h&igrave;nh tr\u1ee5 (T). Di\u1ec7n t&iacute;ch to&agrave;n ph\u1ea7n c\u1ee7a h&igrave;nh tr\u1ee5 (T) l&agrave;:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$S_{tp}=\\pi rh+\\pi r^2$<\/span>.","<strong>B.<\/strong> <span class=\"math-tex\">$S_{tp}=\\pi r\\ell+\\pi r^2$<\/span>.","<strong>C.<\/strong> <span class=\"math-tex\">$S_{tp}=\\pi rh+2\\pi r^2$<\/span>.","<strong>D.<\/strong> <span class=\"math-tex\">$S_{tp}=2\\pi r\\ell+2\\pi r^2$<\/span>."],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;<span class=\"math-tex\">$S_{tp}=2\\pi r\\ell+2\\pi r^2$<\/span>.<\/span><\/p><p>Di\u1ec7n t&iacute;ch xung quanh c\u1ee7a h&igrave;nh tr\u1ee5 (T) l&agrave;:&nbsp;<span class=\"math-tex\">$S_{xq}=2\\pi rh=2\\pi r\\ell$<\/span>.<\/p><p>Di\u1ec7n t&iacute;ch m\u1ed9t \u0111&aacute;y l&agrave;:&nbsp;<span class=\"math-tex\">$S_{\u0111}=\\pi r^2$<\/span>.<\/p><p>Di\u1ec7n t&iacute;ch to&agrave;n&nbsp;ph\u1ea7n c\u1ee7a h&igrave;nh tr\u1ee5 (T) l&agrave;:&nbsp;<span class=\"math-tex\">$S_{tp}=S_{xq}+2.S_{\u0111}=2\\pi r\\ell+2\\pi r^2$<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-04-01 08:36:26","option_type":"math","len":0}]}