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Xác định vùng nhìn thấy 2 điểm S1 và S2 trước gương phẳng ?

Cho S1 và S2 trước gương phẳng

a, xác định vùng nhìn thấy S1

B, Xác định vùng nhìn thấy S2

c, Xác định vùng nhìn thấy 2 điểm

d, Xác định vùng không nhìn thấy ảnh nào <https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.title> <line fill="none" id="svg_1" stroke="#000" stroke-linecap="undefined" stroke-linejoin="undefined" stroke-width="1.5" x1="206" x2="209" y1="76" y2="301.00001"><https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.line> <line fill="none" fill-opacity="null" id="svg_2" stroke="#000" stroke-linecap="undefined" stroke-linejoin="undefined" stroke-opacity="null" stroke-width="1.5" x1="182" x2="207" y1="83" y2="121"><https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.line> <line fill="none" fill-opacity="null" id="svg_3" stroke="#000" stroke-linecap="undefined" stroke-linejoin="undefined" stroke-opacity="null" stroke-width="1.5" x1="182" x2="206" y1="133" y2="162"><https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.line> <line fill="none" fill-opacity="null" id="svg_4" stroke="#000" stroke-linecap="undefined" stroke-linejoin="undefined" stroke-opacity="null" stroke-width="1.5" x1="186" x2="207" y1="187" y2="216"><https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.line> <path d="m283,114" fill="none" fill-opacity="null" id="svg_6" opacity="0.5" stroke="#000" stroke-opacity="null" stroke-width="1.5"><https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.path> <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="181" x2="211" y1="241" y2="272"><https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.line> <text fill="#000000" fill-opacity="null" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_9" stroke="#000" stroke-opacity="null" stroke-width="0" text-anchor="start" x="276" xml:space="preserve" y="105">S1<https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.text> <text fill="#000000" fill-opacity="null" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_11" stroke="#000" stroke-opacity="null" stroke-width="0" text-anchor="start" x="336" xml:space="preserve" y="162">S2<https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.text> <ellipse cx="278.5" cy="115" fill="none" fill-opacity="null" id="svg_12" rx="2.5" ry="5" stroke="#000" stroke-opacity="null" stroke-width="1.5"><https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.ellipse> <ellipse cx="340.5" cy="172" fill="none" fill-opacity="null" id="svg_13" rx="3.5" ry="4" stroke="#000" stroke-opacity="null" stroke-width="1.5"><https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.ellipse> <https:https://hoc247.net/image/faq/data2/216985_.https://hoc247.net/image/faq/data2/216985_.hoc247.nethttps://hoc247.net/image/faq/data2/216985_.imagehttps://hoc247.net/image/faq/data2/216985_.faqhttps://hoc247.net/image/faq/data2/216985_.data2https://hoc247.net/image/faq/data2/216985_.563596_.g> 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<div style="display:none;" class="an" data="FLOATING_RIGHT left_160x600">UREKA</div><style> .ads-4{position:absolute;right:0;top:96px;z-index:200;} @media(min-width:1200px) AND (max-width:1300px){ .ads-4{right:-24px;} } @media(max-width:1360px) { .ads-4{display:none;} } .boxfixedright{position:fixed;top:0px;z-index:200;} </style> <script> jQuery(function($){ if(jQuery('.detail-col-left').length) { var top_2 = jQuery('.detail-col-left').offset().top; //console.log('exist .detail-col-left'); var top_init = '96px'; } if(jQuery('.cate-col-left').length) { var top_2 = jQuery('.cate-col-left').offset().top; //console.log('exist .cate-col-left'); var top_init = '250px'; } if(jQuery('.cate-col-right').length) { var top_2 = jQuery('.cate-col-right').offset().top; //console.log('exist .cate-col-right'); var top_init = '250px'; } //console.log('init top_2='+top_2); jQuery('.ads-4').css('top',top_init); jQuery(window).scroll(function (event) { // if (jQuery('.detail-col-left').length > 0) // { // if(jQuery('.detail-col-left').height() <= 650) // { // return; // } // } var pos_footer_2 = jQuery('#logo_footer').offset().top; //if ( jQuery('#break_300x60').length ) pos_footer_2 = jQuery('#break_300x60').offset().top; var y_2 = jQuery(this).scrollTop(); var inBottomBox_2 = (y_2+610); if(inBottomBox_2>(pos_footer_2-250)) { var intPullPosTop_2 = (pos_footer_2 - inBottomBox_2)-200; jQuery('.ads-4').css('top',intPullPosTop_2); //jQuery('.ads-4').removeClass('boxfixedright'); //jQuery('.ads-4').addClass('ads-4'); //console.log(y + ' =======> ' + pos_footer_2); } else { if (y_2 >= top_2) { jQuery('.ads-4').addClass('boxfixedright'); jQuery('.ads-4').css('top','0px'); } else { jQuery('.ads-4').removeClass('boxfixedright'); jQuery('.ads-4').css('top',top_2); } } }); }); </script> <div class="ads-4" id="ads_right_160x600"> <script async src="https://securepubads.g.doubleclick.net/tag/js/gpt.js"></script> <script> window.googletag = window.googletag || {cmd: []}; googletag.cmd.push(function() { googletag.defineSlot('/2627062/Ureka_Supply_ADM_hoc247.net_PCSkin_1x1_060324', [1, 1], 'div-gpt-ad-1709710358961-0').addService(googletag.pubads()); googletag.pubads().collapseEmptyDivs(); googletag.enableServices(); }); </script> <!-- /2627062/Ureka_Supply_ADM_hoc247.net_PCSkin_1x1_060324 --> <div id='div-gpt-ad-1709710358961-0'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-ad-1709710358961-0'); }); </script> </div> </div> </article> </section> <script> //loadfck('faq_title','100%','80'); //loadfck('faq_content','100%','160'); var deviceType = 'computer'; function closeFaqAnswer(intID) { jQuery('.item-cauhoi[data-id='+intID+'] .i-tool').addClass("displaynone"); var p_intEditorID = "faq_answer"+intID; closeFCK(p_intEditorID); //-- xoa whoedit jQuery.ajax({ type: "POST", url: DOMAIN + "hoidap/savewhoedit", data: {id:intID,clearmember:1}, success: function(data){} }); } function loadFaqAnswer(intID) { dangnhapsudung(); } intPostAns = 1; function addFaqAnswer(intID) { dangnhapsudung(); } function sendNotification() { var member_id = '43671'; var link = window.location.href; if(member_id > 0 ) { jQuery.ajax({ type: "POST", url: DOMAIN + "hoidap/sendnotification", data: {member_id:member_id ,link:link }, success: function(data) { if(data==1) { return true; } } }); } } function followFaq(obj) { dangnhapsudung(); } function likeFaqans(obj) { dangnhapsudung(); } if ( jQuery('img.zoomimg').length > 0 ) { jQuery("body").jsgallery({ imgSelector : "img.zoomimg", //default is img, ommit this property to use default // 0 = image 1 currentImage: 0, // playSpeed: 2000 playSpeed: 2000, // custom footer of the gallery customHTMLFooter : "", // click background overlay to close bgClickClose : false, // templates for nav buttons and close button HTML leftNavHTML : '<i class="fa fa-angle-left" aria-hidden="true"></i>', //<i class="fa fa-chevron-left">', rightNavHTML : '<i class="fa fa-angle-right" aria-hidden="true"></i>', //'<i class="fa fa-chevron-right">', closeHTML : '<span class="icon-close"></span>', // '<i class="fa fa-times"></i>', sideShowHTML : '<i class="fa fa-play" aria-hidden="true"></i>', //'<i class="fa fa-play" aria-hidden="true"></i>' pauseSideShowHTML : '<i class="fa fa-pause" aria-hidden="true"></i>', // '<i class="fa fa-pause" aria-hidden="true"></i>' }); } </script><div class="an" data="BOTTOM_PC">AANETWORK</div><div aan-posId="NTQwXzMz" id="aan-nativebox-930"></div> <script async src="https://cdn.adop.asia/scripts/a/1cc3633c579a90cfdd895e64021e2163.js" crossorigin="anonymous"></script> <div data="PC_POPUP AANETWORK/intVisit=1"> </div><div style="width:100%"><script async src="https://cdn.adop.asia/scripts/a/1679091c5a880faf6fb5e6087eb1b2dc.js" crossorigin="anonymous"></script></div> <style> .menu-ft li{width:30%;} .box-footer-top .menu-ft-50{width:100%;} .contlink a:hover{text-decoration:underline;} </style> <iframe frameborder="0" allowtransparency="true" height="0" width="0" 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} function getNotificationId(p_webId) { jQuery.ajax({ type: "POST", url: DOMAIN + "account/getnotificationid", data: { devicetoken : p_webId }, success: function(data) { // console.log(data); // if(data==1) // { // modalAlert('Bạn đã thêm câu trả lời thành công.', "Thêm câu hỏi thành công", "", "reload"); // //window.location.href = window.location.href; // return true; // } // else // { // modalAlert('Bạn thêm câu trả lời thất bại. Vui lòng thử lại sau', "Thêm câu hỏi thất bại", "", "reload"); // //window.location.href = window.location.href; // return false; // } } }); } </script> <img id="break_300x60" src="images/graphics/blank.gif" width="1px" height="1px" /> <style> .contlink .col-md-4{padding:0px 5px;min-height:185px;} .contlink{background:#f0f0f0;padding:15px 0px 30px 0px;} .contlink h3{font-size:16px;margin:10px 0px;float:left;width:100%;} .contlink h4{font-size:14px;font-weight:500;color:#0482e2;} .contlink h4:before{content:"\25A0";color:#0482e2;width:2px;height:2px;margin-right:5px;margin-left:-12px;font-size:9px;} .contlink p{font-size:13px;margin-bottom:2px;} .contlink .h4m{font-size:16px;font-weight:500;border-bottom:1px solid #e2e2e2;padding-bottom:5px;line-height:25px; padding-top:5px;} .contlink .muiten{float:right;font-size:16px;color:#000;} .contlink .pmo{font-size:15px;margin-bottom:5px;} </style> <div class="contlink" data="lop-7=>10"> <div class="container"> <h3>XEM NHANH CHƯƠNG TRÌNH LỚP 7</h3> <div class="134 col-md-9 hidden-xs"> <div class="col-md-4"> <h4 class="153">Toán 7</h4> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/chuong-trinh/lop-7/toan-hoc/?sgk=1">Toán 7 Kết Nối Tri Thức</a></p> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/chuong-trinh/lop-7/toan-hoc/?sgk=3">Toán 7 Chân Trời Sáng Tạo</a></p> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/chuong-trinh/lop-7/toan-hoc/?sgk=2">Toán 7 Cánh Diều</a></p> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/giai-bai-tap-toan-7-ket-noi-tri-thuc-index.html">Giải bài tập Toán 7 KNTT</a></p> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/giai-bai-tap-toan-7-chan-troi-sang-tao-index.html">Giải bài tập Toán 7 CTST</a></p> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/giai-bai-tap-toan-7-canh-dieu-index.html">Giải bài tập Toán 7 Cánh Diều</a></p> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/trac-nghiem-toan-7-index.html">Trắc nghiệm Toán 7</a></p> <p data="188 2024-04-23/date1=2024-04-10/date2=2024-05-15"><a href="https://hoc247.net/de-thi-hoc-ki-2-lop-7-mon-toan-index.html">Đề thi HK2 môn Toán 7</a></p> </div> <div class="col-md-4"> <h4 class="153">Ngữ văn 7</h4> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/chuong-trinh/lop-7/ngu-van/?sgk=1">Ngữ Văn 7 Kết Nối Tri Thức</a></p> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/chuong-trinh/lop-7/ngu-van/?sgk=3">Ngữ Văn 7 Chân Trời Sáng Tạo</a></p> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a href="https://hoc247.net/chuong-trinh/lop-7/ngu-van/?sgk=2">Ngữ Văn 7 Cánh Diều</a></p> <p data="188 2024-04-23/date1=2024-01-01/date2=2024-12-31"><a 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