{"id":2266,"date":"2026-05-18T18:36:19","date_gmt":"2026-05-18T18:36:19","guid":{"rendered":"https:\/\/mcqacademy.com\/zh\/mcq\/nature-of-roots-for-parameter-4-2\/"},"modified":"2026-05-18T18:36:19","modified_gmt":"2026-05-18T18:36:19","slug":"nature-of-roots-for-parameter-4-2","status":"publish","type":"mcq","link":"https:\/\/mcqacademy.com\/zh\/mcq\/nature-of-roots-for-parameter-4-2\/","title":{"rendered":"\u53c2\u6570 4 \u7684\u6839\u7684\u6027\u8d28"},"content":{"rendered":"<p>\u5bf9\u4e8e\u4e8c\u6b21\u65b9\u7a0b x^2 + (2)x + 4 = 0\uff0c\u5224\u65ad\u5b83\u7684\u6839\u7684\u6027\u8d28\u3002<\/p>\n\n<ul class=\"quiz-options wp-block-list\">\n<li>\u4e24\u4e2a\u76f8\u7b49\u7684\u5b9e\u6839<\/li>\n<li>\u4e24\u4e2a\u4e0d\u76f8\u7b49\u7684\u5b9e\u6839<\/li>\n<li>\u6ca1\u6709\u5b9e\u6839<\/li>\n<li>\u4e00\u4e2a\u6709\u7406\u6839\u548c\u4e00\u4e2a\u65e0\u7406\u6839<\/li>\n<\/ul>\n","protected":false},"author":39,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","topic":[1079,1103,1104],"subject":[1080],"education_level":[5],"class_list":["post-2266","mcq","type-mcq","status-publish","hentry","topic-algebra","topic-discriminant","topic-nature-of-roots","subject-algebra","education_level-hsc"],"mcq_note":"\u628a\u8fd9\u9053\u9898\u770b\u4f5c\u5224\u522b\u5f0f\u95ee\u9898\u3002\u5bf9\u4e8e\u4e8c\u6b21\u65b9\u7a0b ax^2 + bx + c = 0\uff0c\u5148\u786e\u5b9a a = 1\uff0cb = 2\uff0cc = 4\u3002\u7136\u540e\u8ba1\u7b97 D = b^2 - 4ac = (2)^2 - 4(1)(4) = -12\u3002\u56e0\u4e3a D &lt; 0\uff0c\u6240\u4ee5\u65b9\u7a0b\u6ca1\u6709\u5b9e\u6839\u3002\u5224\u522b\u5f0f\u4e3a\u8d1f\u6570\u8868\u793a\u4e8c\u6b21\u516c\u5f0f\u4e2d\u7684\u5e73\u65b9\u6839\u90e8\u5206\u4e0d\u662f\u5b9e\u6570\u3002","mcq_options":[{"right":"no","answer":"\u4e24\u4e2a\u76f8\u7b49\u7684\u5b9e\u6839"},{"right":"no","answer":"\u4e24\u4e2a\u4e0d\u76f8\u7b49\u7684\u5b9e\u6839"},{"right":"yes","answer":"\u6ca1\u6709\u5b9e\u6839"},{"right":"no","answer":"\u4e00\u4e2a\u6709\u7406\u6839\u548c\u4e00\u4e2a\u65e0\u7406\u6839"}],"multi_answers":"no","subject_terms":[{"id":1080,"title":"Algebra","slug":"algebra"}],"topic_terms":[{"id":1079,"title":"Algebra","slug":"algebra"},{"id":1103,"title":"Discriminant","slug":"discriminant"},{"id":1104,"title":"Nature Of Roots","slug":"nature-of-roots"}],"_links":{"self":[{"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/mcq\/2266","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/mcq"}],"about":[{"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/types\/mcq"}],"author":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/users\/39"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/comments?post=2266"}],"wp:attachment":[{"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/media?parent=2266"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/topic?post=2266"},{"taxonomy":"subject","embeddable":true,"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/subject?post=2266"},{"taxonomy":"education_level","embeddable":true,"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/education_level?post=2266"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}