{"id":2410,"date":"2026-05-18T20:12:52","date_gmt":"2026-05-18T20:12:52","guid":{"rendered":"https:\/\/mcqacademy.com\/zh\/mcq\/geometric-progression-calculation-18\/"},"modified":"2026-05-18T20:12:52","modified_gmt":"2026-05-18T20:12:52","slug":"geometric-progression-calculation-18","status":"publish","type":"mcq","link":"https:\/\/mcqacademy.com\/zh\/mcq\/geometric-progression-calculation-18\/","title":{"rendered":"\u7b49\u6bd4\u6570\u5217\u8ba1\u7b97 18"},"content":{"rendered":"<p>\u5bf9\u4e8e\u4e00\u4e2a\u9996\u9879\u4e3a -2\u3001\u516c\u6bd4\u4e3a 3 \u7684\u7b49\u6bd4\u6570\u5217\uff0c\u6c42\u524d 6 \u9879\u7684\u548c\u3002<\/p>\n\n<ul class=\"quiz-options wp-block-list\">\n<li>-727<\/li>\n<li>728<\/li>\n<li>-1456<\/li>\n<li>-728<\/li>\n<\/ul>\n","protected":false},"author":39,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","topic":[1079,1007],"subject":[1080],"education_level":[5],"class_list":["post-2410","mcq","type-mcq","status-publish","hentry","topic-algebra","topic-sequences-and-series","subject-algebra","education_level-hsc"],"mcq_note":"\u5bf9\u4e8e\u7b49\u6bd4\u6570\u5217\uff0c\u6bcf\u4e00\u9879\u90fd\u7531\u524d\u4e00\u9879\u4e58\u4ee5\u76f8\u540c\u7684\u516c\u6bd4\u5f97\u5230\u3002\u672c\u9898\u8981\u6c42\u548c\uff0c\u56e0\u6b64\u5e94\u4f7f\u7528\u6709\u9650\u7b49\u6bd4\u6570\u5217\u6c42\u548c\u516c\u5f0f\uff0c\u800c\u4e0d\u662f\u624b\u52a8\u9010\u9879\u76f8\u52a0\u3002\u5f53 r\u22601 \u65f6\uff0cS_n=a(r^n-1)\/(r-1)\u3002\u6240\u4ee5 S_6=-2((3)^6-1)\/(3-1)=-728\u3002\u8981\u7279\u522b\u6ce8\u610f\u9996\u9879\u548c\u516c\u6bd4\u7684\u7b26\u53f7\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f1a\u51b3\u5b9a\u548c\u662f\u6b63\u6570\u8fd8\u662f\u8d1f\u6570\u3002","mcq_options":[{"right":"no","answer":"-727"},{"right":"no","answer":"728"},{"right":"no","answer":"-1456"},{"right":"yes","answer":"-728"}],"multi_answers":"no","subject_terms":[{"id":1080,"title":"Algebra","slug":"algebra"}],"topic_terms":[{"id":1079,"title":"Algebra","slug":"algebra"},{"id":1007,"title":"\u6570\u5217\u4e0e\u7ea7\u6570","slug":"sequences-and-series"}],"_links":{"self":[{"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/mcq\/2410","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=2410"}],"wp:attachment":[{"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/media?parent=2410"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/topic?post=2410"},{"taxonomy":"subject","embeddable":true,"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/subject?post=2410"},{"taxonomy":"education_level","embeddable":true,"href":"https:\/\/mcqacademy.com\/zh\/wp-json\/wp\/v2\/education_level?post=2410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}