Luyện tập chung (sau bài 25, 26).

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{"common":{"save":0,"post_id":"8602","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"10524","post_id":"8602","mon_id":"1159278","chapter_id":"1159332","question":"T\u1ed5 1 c\u1ee7a l\u1edbp 9A có 5 h\u1ecdc sinh g\u1ed3m 3 b\u1ea1n nam là Tú, B\u1ea3o, Vinh và 2 b\u1ea1n n\u1eef là Mai và Hu\u1ec7. Xác su\u1ea5t c\u1ee7a bi\u1ebfn c\u1ed1 A: “L\u1ea5y ng\u1eabu nhiên 1 b\u1ea1n <\/strong>nam <\/strong><\/span>t\u1eeb t\u1ed5 1” <\/strong><\/span>là:<\/p>","options":["A.<\/strong> $\\dfrac{2}{5}$<\/span>","B.<\/strong> $\\dfrac{3}{5}$<\/span>","C.<\/strong> $\\dfrac{1}{5}$<\/span>","D.<\/strong> $\\dfrac{4}{5}$<\/span>"],"correct":"2","level":"2","hint":"","answer":"Ch\u1ecdn B.<\/strong> $\\dfrac{3}{5}$<\/span><\/span><\/p>Ta có: $\\Omega$<\/span> = {Tú, B\u1ea3o, Vình, Mai, Hu\u1ec7}; A = {Tú, B\u1ea3o, Vình}.<\/p>S\u1ed1 ph\u1ea7n t\u1eed c\u1ee7a không gian m\u1eabu là 5.<\/p>S\u1ed1 k\u1ebft qu\u1ea3 thu\u1eadn l\u1ee3i cho bi\u1ebfn s\u1ed1 A là 3.<\/p>V\u1eady xác su\u1ea5t c\u1ee7a bi\u1ebfn c\u1ed1 A là $\\dfrac{3}{5}$<\/span><\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-03-10 09:39:11","option_type":"math","len":0},{"id":"10525","post_id":"8602","mon_id":"1159278","chapter_id":"1159332","question":"Xét phép th\u1eed tung m\u1ed9t con xúc x\u1eafc cân \u0111\u1ed1i và \u0111\u1ed3ng ch\u1ea5t có 6 m\u1eb7t. G\u1ecdi A là bi\u1ebfn c\u1ed1 “Nh\u1eadn \u0111\u01b0\u1ee3c m\u1eb7t có s\u1ed1 ch\u1ea5m là s\u1ed1 chia h\u1ebft cho 3”<\/strong><\/span>. Có bao nhiêu k\u1ebft qu\u1ea3 thu\u1eadn l\u1ee3i cho bi\u1ebfn c\u1ed1 A ?<\/p>","options":["A.<\/strong> 4","B.<\/strong> 3","C.<\/strong> 2","D.<\/strong> 6"],"correct":"3","level":"2","hint":"","answer":"Ch\u1ecdn C.<\/strong> 2.<\/span><\/p>K\u1ebft qu\u1ea3 khi tung xúc x\u1eafc 6 m\u1eb7t là $\\Omega$<\/span> = {1; 2; 3; 4; 5; 6}.<\/p>Trong \u0111ó có 2 s\u1ed1 chia h\u1ebft cho 3 là 3 và 6.<\/p>V\u1eady có 2 k\u1ebft qu\u1ea3 thu\u1eadn l\u1ee3i cho bi\u1ebfn c\u1ed1 A.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-03-10 09:41:48","option_type":"txt","len":0},{"id":"10527","post_id":"8602","mon_id":"1159278","chapter_id":"1159332","question":"\u0110\u1ed9i v\u0103n ngh\u1ec7 có 4 b\u1ea1n: Hùng; D\u0169ng; Dung; Nguy\u1ec7t. Cô giáo mu\u1ed1n ch\u1ecdn ra 2 b\u1ea1n \u0111i thi hát. Tính xác su\u1ea5t c\u1ee7a bi\u1ebfn c\u1ed1 F: “Trong hai b\u1ea1n \u0111\u01b0\u1ee3c ch\u1ecdn có b\u1ea1n Dung”.<\/strong><\/span><\/p>","options":["A.<\/strong> $\\dfrac{1}{2}$<\/span>","B.<\/strong> $\\dfrac{1}{3}$<\/span>","C.<\/strong> $\\dfrac{1}{6}$<\/span>","D.<\/strong> $\\dfrac{1}{4}$<\/span>"],"correct":"1","level":"2","hint":"","answer":"Ch\u1ecdn A.<\/strong> $\\dfrac{1}{2}$<\/span>.<\/span><\/p>Ta có: $\\Omega$<\/span> = {{Hùng – D\u0169ng; Hùng – Dung; Hùng – Nguy\u1ec7t; D\u0169ng – Dung; D\u0169ng – Nguy\u1ec7t; Dung – Nguy\u1ec7t}.<\/p>F = {Hùng – Dung; D\u0169ng – Dung; Dung – Nguy\u1ec7t}.<\/p>V\u1eady $P(F)=\\dfrac{3}{6}=\\dfrac{1}{2}$<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-03-10 09:45:13","option_type":"math","len":0}]}