{"id":4424,"date":"2025-10-23T12:19:52","date_gmt":"2025-10-23T04:19:52","guid":{"rendered":"http:\/\/47.95.222.19\/?p=4424"},"modified":"2025-11-04T17:03:47","modified_gmt":"2025-11-04T09:03:47","slug":"%e4%b8%89%e8%a7%92%e9%a2%98%e7%9b%ae1","status":"publish","type":"post","link":"http:\/\/jhwk.online\/?p=4424","title":{"rendered":"\u4e09\u89d2\u9898\u76ee1"},"content":{"rendered":"\n<div class=\"wp-block-stackable-subtitle stk-block-subtitle stk-block stk-8afe3d6\" data-block-id=\"8afe3d6\"><style>.stk-8afe3d6 .stk-block-subtitle__text{font-size:var(--stk--preset--font-size--medium, 20px) !important;color:#0693e3 !important;}@media screen and (max-width:999px){.stk-8afe3d6 .stk-block-subtitle__text{font-size:var(--stk--preset--font-size--medium, 20px) !important;}}<\/style><p class=\"stk-block-subtitle__text stk-subtitle has-text-color\">\u672c\u9898\u75312023\u7ea725\u73ed\u5b59\u5b81\u6893\u8bb2\u89e3\uff01<\/p><\/div>\n\n\n\n<figure class=\"wp-block-video\"><video height=\"544\" style=\"aspect-ratio: 960 \/ 544;\" width=\"960\" controls src=\"http:\/\/47.95.222.19\/wp-content\/uploads\/2025\/10\/c181742051b7ed70c236887a93f0a0b2.mp4\"><\/video><\/figure>\n\n\n\n<p>[ratemypost]<\/p>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-vivid-cyan-blue-color has-alpha-channel-opacity has-vivid-cyan-blue-background-color has-background is-style-wide\"\/>\n\n\n\n<h5 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-8a052dbd5caa870510f1e594e9e095cf\">\u9898\u76ee\u5c55\u793a\u2014\u2014\u5148\u63a2\u7a76\u3001\u518d\u542c\u8bb2<\/h5>\n\n\n\n\u9898\u76ee1\n\u5982\u56fe\uff0c\u5728$\\triangle ABC$\u4e2d\uff0c$\\angle BAC=\\displaystyle\\frac{2\\pi}{3}$\uff0c\u70b9$D$\u5728\u7ebf\u6bb5$BC$\u4e0a\uff0c$AD\\perp AC$\uff0c$\\displaystyle\\frac{BD}{CD}=\\frac{1}{4}$\uff0c\u6c42$\\sin C.$\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"406\" height=\"172\" src=\"http:\/\/47.95.222.19\/wp-content\/uploads\/2025\/09\/tzsanjiaohanshu1.png\" alt=\"\" class=\"wp-image-4326\" srcset=\"http:\/\/jhwk.online\/wp-content\/uploads\/2025\/09\/tzsanjiaohanshu1.png 406w, http:\/\/jhwk.online\/wp-content\/uploads\/2025\/09\/tzsanjiaohanshu1-300x127.png 300w\" sizes=\"auto, (max-width: 406px) 100vw, 406px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color has-medium-font-size wp-elements-8366a06008302950c0f8fd2d6d694915\" style=\"color:#1e4b69;background:linear-gradient(0deg,rgb(230,242,255) 0%,rgb(230,242,255) 16%,rgb(92,175,230) 100%)\">\u89e3\u9898\u63a2\u7a76\u2014\u2014\u70b9\u51fb\u76f4\u8fbe<\/h4>\n\n\n\n<style>\n  .video-jump-btn {\n    cursor: pointer;\n    text-align: left;\n    background-color: #e6f2ff; \/* \u6de1\u84dd\u8272\u80cc\u666f *\/\n    border: none;\n    padding: 8px 12px;\n    border-radius: 4px;\n    transition: all 0.3s ease; \/* \u5e73\u6ed1\u8fc7\u6e21\u52a8\u753b *\/\n    font-size: 16px;\n  }\n  \n  .video-jump-btn:hover {\n    background-color: #cce0ff; \/* \u7565\u6df1\u7684\u84dd\u8272\u80cc\u666f *\/\n    transform: scale(1.02); \/* \u8f7b\u5fae\u653e\u5927\u6548\u679c *\/\n    box-shadow: 0 2px 4px rgba(0,0,0,0.1); \/* \u589e\u52a0\u8f7b\u5fae\u9634\u5f71 *\/\n  }\n<\/style>\n\n<button class=\"video-jump-btn\" onclick=\"document.querySelector('video').currentTime =0; document.querySelector('video').play();\">\n\u7b2c\u4e00\u6b65\uff1a\u95ee\u9898\u5206\u6790\uff1b\n<\/button>\n\n\n\n<br>\n\n<style>\n  .video-jump-btn {\n    cursor: pointer;\n    text-align: left; \/* \u5de6\u5bf9\u9f50\u6587\u672c *\/\n   \n  }\n<\/style>\n\n<button class=\"video-jump-btn\" onclick=\"document.querySelector('video').currentTime = 82; document.querySelector('video').play();\">\n    \u7b2c\u4e8c\u6b65\uff1a\u5f97\u51fa$5\\sin C=\\sqrt{3}\\cos C$;\n\n<\/button>\n\n\n\n<br>\n\n<style>\n  .video-jump-btn {\n    cursor: pointer;\n    text-align: left; \/* \u5de6\u5bf9\u9f50\u6587\u672c *\/\n   \n  }\n<\/style>\n\n<button class=\"video-jump-btn\" onclick=\"document.querySelector('video').currentTime = 215; document.querySelector('video').play();\">\n    \u7b2c\u4e09\u6b65\uff1a\u8ba1\u7b97\u7ed3\u679c$\\sin C = \\displaystyle\\frac{\\sqrt{21}}{14}$.\n\n<\/button>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-pale-cyan-blue-color has-alpha-channel-opacity has-pale-cyan-blue-background-color has-background is-style-wide\"\/>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>\u7b54\u6848\u89e3\u6790<\/summary>\n \n\n\n\n\u5728\u25b3ABD\u4e2d\uff0c\n$ \\displaystyle\\frac{BD}{\\sin\\displaystyle\\frac{\\pi}{6}} =\\displaystyle \\frac{AD}{\\sin B}$\n<p>$ \\therefore \\displaystyle\\frac{n}{\\sin\\displaystyle\\frac{\\pi}{6}} = \\displaystyle\\frac{4n\\sin C}{\\sin B}$\n<p>$ \\therefore\\displaystyle\\frac{1}{\\displaystyle\\frac{1}{2}} =\\displaystyle \\frac{4\\sin C}{\\sin( \\displaystyle\\frac{2\\pi}{3}-C)}$\n<p>$\\therefore2 = \\displaystyle\\frac{4\\sin C}{\\displaystyle\\frac{\\sqrt{3}}{2}\\cos C -\\displaystyle \\frac{1}{2}\\sin C}$\n<p>$\\therefore\\begin{cases} 5\\sin C = \\sqrt{3}\\cos C \\\\ \\sin^2 C + \\cos^2 C = 1 \\end{cases}$\n<p>$\\therefore\\sin C =\\displaystyle \\frac{\\sqrt{21}}{14}$\n<\/details>\n\n\n\n \n","protected":false},"excerpt":{"rendered":"<p>\u672c\u9898\u75312023\u7ea725\u73ed\u5b59\u5b81\u6893\u8bb2\u89e3\uff01 [ratemypost] \u9898\u76ee\u5c55\u793a\u2014\u2014\u5148\u63a2\u7a76\u3001\u518d\u542c\u8bb2 \u9898\u76ee1 \u5982\u56fe\uff0c\u5728$\\ [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4424","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"blocksy_meta":[],"_links":{"self":[{"href":"http:\/\/jhwk.online\/index.php?rest_route=\/wp\/v2\/posts\/4424","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/jhwk.online\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/jhwk.online\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/jhwk.online\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/jhwk.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4424"}],"version-history":[{"count":13,"href":"http:\/\/jhwk.online\/index.php?rest_route=\/wp\/v2\/posts\/4424\/revisions"}],"predecessor-version":[{"id":4596,"href":"http:\/\/jhwk.online\/index.php?rest_route=\/wp\/v2\/posts\/4424\/revisions\/4596"}],"wp:attachment":[{"href":"http:\/\/jhwk.online\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4424"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/jhwk.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4424"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/jhwk.online\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}