排列13...(2n-1)24...(2n)的逆序数为_______,排列13...(2n-1)(2n)(2n-2)...2的逆序数为_______.

13...(2n-1)24...2n求其逆序数?

排列13...(2n-1)24...(2n)的逆序数是 。

2n阶排列24...(2n)13...(2n-1)的逆序数是(__).

有一分数序列:2/1,3/2,5/3,8/5,13/8,21/13...求出这个数列的前20项之和。(10分)

【多选题】13 13 13 13 A. 13 13 B. 13 13 C. 13 13 D. 13 13

排列\(13...（2n-1）(2n)(2n-2)...42\)的逆序数为 A: \(n(n+1)\) B: \(n(n+1)/2\) C: \(n(n-1)/2\) D: \(n(n-1)\)

【单选题】13 13 13 13 A. 13 B. 13 C. 13 D. 13

在HTML中 标记的作用是 A. 在窗口中划一条水平线 B. 换行 C. 设置链接 D. 插入表格 正确答案：D 学生答案：B 错误 得分：0.0 分 取消 确定 
 Zepto(function($){
 
 //$("img:not(.ans-formula-moudle,.goTop)").on('click',function(){
 $("img:not(.ans-formula-moudle)").not('.goTop').on('click',function(){
 var url = $(this).attr("src");
 jsBridge.postNotification("CLIENT_PREVIEW_IMAGES", {
 imageUrls : [{
 imageUrl : url,
 getOriginSize : 1
 }],
 showIndex : 0
 });
 });
 
 
 $('.folding').each(function(index){
 var folding = $(this);
 folding.tap(function(){
 var zlo_opened = folding.find("a");
 if(zlo_opened.hasClass("zlo_opened")){
 folding.next().hide();
 zlo_opened.removeClass("zlo_opened");
 }else{
 folding.next().show();
 zlo_opened.addClass("zlo_opened");
 }
 });
 });
 
 });
 
 $('.folding2').each(function(index){
 var folding = $(this);
 folding.tap(function(){
 var zlo_opened = folding.find("a");
 if(zlo_opened.hasClass("zlo_opened")){
 folding.next().fadeOut();
 zlo_opened.removeClass("zlo_opened");
 $(folding.next()).data("loaded",true);
 }else{
 folding.next().fadeIn();
 zlo_opened.addClass("zlo_opened");
 if(!$(folding.next()).data("loaded")){
 voteStatistic(folding.next(),zlo_opened.attr("data"));
 }
 }
 });
 });
 
 function _jsBridgeReady() {
 var icon = ServerHost.moocDomain + "/images/work/phone/reWork.png";
 jsBridge.postNotification('CLIENT_CUSTOM_MENU', {
 show : '1',
 icon : icon,
 menu : '',
 option : "rework()",
 index : '0',
 width : '65',
 height : '18'
 });
 
 jsBridge.bind('CLIENT_REFRESH_EVENT', function(object){
 window.location.reload();
 });
 }
 
 function rework() {
 var answerId = $("#examAnswerId").val();
 var relationId = $("#examRelationId").val();
 var courseId = $("#courseId").val();
 var classId = $("#classId").val();
 
 $(".cx_alert-txt").html("打回后学生需要重新提交考试！");
 $("#okBtn").html("打回");
 $(".cx_alert").css("display", "block");
 $(".cx_alert-box").css("display", "block");
 $("#okBtn").unbind();
 $("#cancelBtn").unbind();
 $("#okBtn").on("click", function() {
 $(".cx_alert").css("display", "none");
 $(".cx_alert-box").css("display", "none");
 var url = "/exam/phone/reTest?classId=" + classId + "&answerId=" + answerId + "&relationId=" + relationId + "&courseId=" + courseId;
 $.ajax({
 url : url,
 type : 'get',
 dataType : 'json',
 success : function(data) {
 openWindowHintClient(1, data.msg, function() {
 jsBridge.postNotification("CLIENT_REFRESH_STATUS", {
 "status" : 1
 });
 jsBridge.postNotification('CLIENT_EXIT_LEVEL', {
 message : ''
 });
 }, 1000);
 }
 });
 });
 $("#cancelBtn").on("click", function() {
 $(".cx_alert").css("display", "none");
 $(".cx_alert-box").css("display", "none");
 });
 }
 
/images/phone/goTop.png

用50分度的卡尺测一长度，7次测量的结果（单位：mm）分别为：139.70,13...分布，则总不确定度（保留两位有效数字）为