Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"7115","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5512","post_id":"7115","mon_id":"1158924","chapter_id":"1159174","question":"<p>Cho hình l\u0103ng tr\u1ee5 tam giác \u0111\u1ec1u ABC.A'B'C' có AB = a và AA' = <span class=\"math-tex\">$a\\sqrt{2}$<\/span>. Góc gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng AB' và BC' b\u1eb1ng<\/p>","options":["<strong>A.<\/strong> 90°","<strong>B.<\/strong> 30°","<strong>C.<\/strong> 60°","<strong>D.<\/strong> 45°"],"correct":"3","level":"2","hint":"","answer":"<p><span class=\"svgedit\"><svg height=\"300\" width=\"300\"> <g> <title><\/title> <rect fill=\"#fff\" height=\"302\" id=\"canvas_background\" width=\"302\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_2\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g> <title><\/title> <g id=\"svg_8\"> <path d=\"m97.02144,100.93322l161.63855,-76.25105l-233.99999,0l72.36144,76.25105z\" fill=\"none\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <path d=\"m96.02144,290.93322l161.63855,-76.25105l-233.99999,0l72.36144,76.25105z\" fill=\"none\" id=\"svg_38\" stroke=\"#000000\" stroke-width=\"1.5\"><\/path> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_5\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"23.99999\" x2=\"23.99999\" y1=\"24.85\" y2=\"214.67425\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_11\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"257.99999\" x2=\"257.99999\" y1=\"25.85\" y2=\"215.67425\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_12\" stroke=\"#ffffff\" stroke-dasharray=\"5,5\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-width=\"2\" x1=\"32\" x2=\"236.99999\" y1=\"214.84999\" y2=\"214.84999\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_13\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"95.99999\" x2=\"95.99999\" y1=\"100.85\" y2=\"290.67425\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_15\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"70\" xml:space=\"preserve\" y=\"116.85\">A'<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_16\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"1.99999\" xml:space=\"preserve\" y=\"31.85\">C'<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_17\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"66\" xml:space=\"preserve\" y=\"297.84999\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_18\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"1.99999\" xml:space=\"preserve\" y=\"227.84999\">C<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_19\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"266\" xml:space=\"preserve\" y=\"219.84999\">B<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_20\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"265\" xml:space=\"preserve\" y=\"30.85\">B'<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_21\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"177\" xml:space=\"preserve\" y=\"271.84999\">M<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_22\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"272\" xml:space=\"preserve\" y=\"126.84999\">N<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_23\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"133.99999\" xml:space=\"preserve\" y=\"22.85\">P<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_24\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"119.99999\" xml:space=\"preserve\" y=\"209.84999\">E<\/text> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_25\" stroke=\"#000\" stroke-dasharray=\"5,5\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"141.99999\" x2=\"142\" y1=\"24.85\" y2=\"215.84999\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_33\" stroke=\"#000\" stroke-dasharray=\"5,5\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"142\" x2=\"175.99999\" y1=\"213.84999\" y2=\"249.84999\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_34\" stroke=\"#0000ff\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-width=\"1.5\" x1=\"257.99999\" x2=\"96.99999\" y1=\"23.85\" y2=\"290.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_35\" stroke=\"#ff0000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-width=\"1.5\" x1=\"177.99999\" x2=\"256.99999\" y1=\"251.84999\" y2=\"118.84999\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_36\" stroke=\"#0000ff\" stroke-dasharray=\"5,5\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-width=\"1.5\" x1=\"26.99999\" x2=\"257.99999\" y1=\"25.85\" y2=\"216.84999\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_37\" stroke=\"#ff0000\" stroke-dasharray=\"5,5\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-width=\"1.5\" x1=\"256.99999\" x2=\"143\" y1=\"117.84999\" y2=\"27.85\"><\/line> <line fill=\"none\" id=\"svg_3\" stroke=\"#ff0000\" stroke-dasharray=\"5,5\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-width=\"1.5\" x1=\"142\" x2=\"177.99999\" y1=\"23.85\" y2=\"251.84999\"><\/line> <text fill=\"#ff0000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"30\" id=\"svg_7\" stroke=\"#ff0000\" stroke-width=\"0\" text-anchor=\"start\" x=\"235.99999\" xml:space=\"preserve\" y=\"128.84999\">(<\/text> <\/g> <\/g> <\/svg><\/span><\/p><p>G\u1ecdi M, N, P, E l\u1ea7n l\u01b0\u1ee3t là trung \u0111i\u1ec3m c\u1ee7a các \u0111o\u1ea1n th\u1eb3ng AB, BB', B'C', BC.<\/p><p>Suy ra MN \/\/ AB' và NP \/\/ BC'. Khi \u0111ó góc gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng AB' và BC' là góc gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng MN và NP.<\/p><p>Ta có MN = NP = <span class=\"math-tex\">$\\dfrac{a\\sqrt{3}}{2}$<\/span> .<\/p><p>Xét tam giác PEM vuông t\u1ea1i E, <span class=\"math-tex\">$MP^2 = PE^2 + ME^2 =$<\/span> <span class=\"math-tex\">$2a^2+\\dfrac{a^2}{4}=\\dfrac{9a^2}{4}$<\/span>.<\/p><p>Dùng \u0111\u1ecbnh lí cosin trong tam giác MNP, ta có<\/p><p><span class=\"math-tex\">$\\cos MNP=\\dfrac{MN^2+NP^2-MP^2}{2.MN.NP}=\\dfrac{\\dfrac{3a^2}{4}+\\dfrac{3a^2}{4}-\\dfrac{9a^2}{4}}{2.\\dfrac{3a^2}{4}}=-\\dfrac{1}{2}$<\/span><\/p><p>Do \u0111ó góc MNP b\u1eb1ng 120° nên góc gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng AB' và BC' b\u1eb1ng 60°.<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> 60°.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-04-21 02:50:00","option_type":"txt","len":0},{"id":"5536","post_id":"7115","mon_id":"1158924","chapter_id":"1159174","question":"<p>Cho hình chóp S.ABCD có \u0111áy ABCD là hình ch\u1eef nh\u1eadt v\u1edbi AB = 2a, BC = a. Các c\u1ea1nh bên c\u1ee7a hình chóp c\u0169ng b\u1eb1ng <span class=\"math-tex\">$a\\sqrt{2}$<\/span>. Tính góc gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng AB và SC.<\/p>","options":["<strong>A.<\/strong> 45°","<strong>B.<\/strong> 30°","<strong>C.<\/strong> 60°","<strong>D.<\/strong> arctan 2"],"correct":"1","level":"2","hint":"","answer":"<p><span class=\"svgedit\"><svg height=\"230\" width=\"303\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"none\" height=\"232\" id=\"canvas_background\" width=\"305\" 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><title><\/title><image height=\"218\" id=\"svg_1\" width=\"295\" x=\"1.5\" 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\" y=\"4\"><\/image> <\/g> <\/svg><\/span><\/p><p>Ta có AB \/\/ CD nên (AB, SC) = (CD, SC).<\/p><p>G\u1ecdi M là trung \u0111i\u1ec3m c\u1ee7a CD. Tam giác SCM vuông t\u1ea1i M và có SC = <span class=\"math-tex\">$a\\sqrt{2}$<\/span>, CM = a nên là tam giác vuông cân t\u1ea1i M nên góc SCD b\u1eb1ng 45°.<\/p><p>V\u1eady góc gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng AB và SC b\u1eb1ng 45°.<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> 45°.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-04-21 05:07:42","option_type":"txt","len":1},{"id":"5537","post_id":"7115","mon_id":"1158924","chapter_id":"1159174","question":"<p>Cho hình l\u1eadp ph\u01b0\u01a1ng ABCD.A'B'C'D'. Góc gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng A'C' và BD b\u1eb1ng<\/p>","options":["<strong>A.<\/strong> 60°","<strong>B.<\/strong> 30°","<strong>C.<\/strong> 45°","<strong>D.<\/strong> 90°"],"correct":"4","level":"2","hint":"","answer":"<p><span class=\"svgedit\"><svg height=\"240\" width=\"280\"> <g><title><\/title><rect fill=\"none\" height=\"242\" id=\"canvas_background\" width=\"282\" 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><title><\/title><line fill=\"none\" id=\"svg_2\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"81.5\" x2=\"247.5\" y1=\"32.5\" y2=\"31.5\"><\/line> <line fill=\"none\" id=\"svg_3\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"26.5\" x2=\"183.5\" y1=\"82.5\" y2=\"81.5\"><\/line> <line fill=\"none\" id=\"svg_4\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"82.5\" x2=\"27.5\" y1=\"31.5\" y2=\"82.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_5\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"248.5\" x2=\"182.5\" y1=\"30.5\" y2=\"82.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_6\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"82.5\" x2=\"182.5\" y1=\"32.5\" y2=\"81.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_7\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"25.5\" x2=\"26.5\" y1=\"83.5\" y2=\"212.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_8\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"248.5\" x2=\"248.5\" y1=\"157.5\" y2=\"32.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_9\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"25.5\" x2=\"185.5\" y1=\"211.5\" y2=\"207.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_10\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"182.5\" x2=\"185.5\" y1=\"80.5\" y2=\"210.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_11\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"249.5\" x2=\"183.5\" y1=\"157.5\" y2=\"209.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_12\" stroke=\"#000\" stroke-dasharray=\"5,5\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"81.5\" x2=\"81.5\" y1=\"33.5\" y2=\"157.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_14\" stroke=\"#000\" stroke-dasharray=\"5,5\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"26\" x2=\"249\" y1=\"210.25\" y2=\"156.25\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_15\" stroke=\"#000\" stroke-dasharray=\"5,5\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"82\" x2=\"179\" y1=\"160.25\" y2=\"204.25\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_16\" stroke=\"#000\" stroke-dasharray=\"5,5\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"79.5\" x2=\"30.5\" y1=\"161.25\" y2=\"206.25\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_17\" stroke=\"#000\" stroke-dasharray=\"5,5\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"246.5\" x2=\"81.5\" y1=\"157.25\" y2=\"159.25\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_18\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"68.5\" xml:space=\"preserve\" y=\"26.25\">A'<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_19\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"6.5\" xml:space=\"preserve\" y=\"87.25\">B'<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_20\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"8.5\" xml:space=\"preserve\" y=\"224.25\">B<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_21\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"249.5\" xml:space=\"preserve\" y=\"28.25\">D'<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_22\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"173.5\" xml:space=\"preserve\" y=\"75.25\">C'<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_23\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"63.5\" xml:space=\"preserve\" y=\"161.25\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_24\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"183.5\" xml:space=\"preserve\" y=\"227.25\">C<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_25\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"252.5\" xml:space=\"preserve\" y=\"170.25\">D<\/text> <\/g> <\/svg><\/span><\/p><p>Vì A'C' \/\/ AC nên (A'C' ; BD) = (AC ; BD) = 90°<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-04-21 05:17:04","option_type":"txt","len":0}]}