{"show":[{"id":2455,"catid":"28354,10099,12231,16026,17339,41466,44083,27081,75870,26654,95446,95443,10105,21368,25113,102789","title":"根据实际问题列二次函数关系式","subtitle":"根据实际问题列二次函数关系式","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/6.png","goals":null,"intro":"根据实际问题列二次函数关系式先要理解问题,分析问题中的变量和常量,以及它们之间的关系,找出等量关系,然后列出二次函数的解析式,并根据自变量的实际意义,确定自变量的取值范围。","ratingnum":0,"rating":0,"hits":30,"teachername":"杨俊丽","publisheruid":0,"uid":81,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":null,"admin":385,"createdtime":1491547496,"updatedtime":1495085459},{"id":1512,"catid":"28354,10104,12228,21371,17336,25198,41466,44087,27081,75870,26662,95443,10105,11461,11462,100385,102697,100420,25113","title":"二次函数的应用","subtitle":"二次函数的应用","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/3.png","goals":null,"intro":"最值问题常常用在利润最大化的问题中,解这类题目的一般步骤是:\r\n(1)列出二次函数的解析式,并根据自变量的实际意义,确定自变量的取值范围;\r\n(2)在自变量的取值范围内,运用公式法或通过配方求出二次函数的最大值或最小值。\r\n","ratingnum":0,"rating":0,"hits":40,"teachername":"薛江辉","publisheruid":0,"uid":83,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":0,"admin":385,"createdtime":1477545789,"updatedtime":1495085445},{"id":2413,"catid":"9903,12174,14858,17373,24962,27246,26834,75112,26398,88450,14859,28357,75840,75846,102925,95234,104143,102799,102800,77200","title":"几何体的展开图","subtitle":"几何体的展开图","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/3.png","goals":null,"intro":"圆柱的侧面展开图是一个长方形,长方形的长与底面圆周的周长是相等的。圆锥的侧面展开图是一个扇形,扇形的弧长与底面圆周的周长是相等的。","ratingnum":0,"rating":0,"hits":37,"teachername":"杨俊丽","publisheruid":0,"uid":81,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":null,"admin":385,"createdtime":1491449374,"updatedtime":1495085179},{"id":1576,"catid":"17373,10262,10021,12166,17048,25111,41401,70392,26931,75266,26564,16453,9903,12174,14858,24962,27246,26834,75112,26398,88450,14859,28357,75840,75846,102925,95234,104143,102799,102800,77200","title":"平面展开-最短路径问题","subtitle":"平面展开-最短路径问题","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/6.png","goals":null,"intro":"把几何体适当展开成平面图形,再利用“两点之间线段最短”,或点到直线“垂线段最短”等性质来解决问题。","ratingnum":0,"rating":0,"hits":315,"teachername":"杨俊丽","publisheruid":0,"uid":83,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"14929","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":0,"admin":385,"createdtime":1477552284,"updatedtime":1495078318},{"id":2523,"catid":"10293,15822,12243,21345,17237,25195,41507,44092,27004,43558,75254,26636,99901,99953","title":"比例的性质","subtitle":"比例的性质","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/3.png","goals":null,"intro":"表示两个比相等的式子叫做比例,判断两个比能不能组成比例,要看它们的比值是否相等。","ratingnum":0,"rating":0,"hits":24,"teachername":"薛江辉","publisheruid":0,"uid":81,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":null,"admin":385,"createdtime":1492497599,"updatedtime":1495073179},{"id":2524,"catid":"10293,15822,12243,21345,17237,25195,41507,44092,27005,43558,75254,26636,99901,99953","title":"比例线段","subtitle":"比例线段","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/1.png","goals":null,"intro":"两条线段的长度比叫做这两条线段的比。同一单位下,如果四条线段a,b,c,d满足a/b=c/d,则这四条线段称为成比例线段,简称比例线段。","ratingnum":0,"rating":0,"hits":24,"teachername":"薛江辉","publisheruid":0,"uid":81,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":null,"admin":385,"createdtime":1492497816,"updatedtime":1495073130},{"id":1700,"catid":"104119,10293,15823,12243,21345,17236,25196,41507,44092,27005,43559,75254,26638,99953","title":"黄金分割","subtitle":"黄金分割","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/1.png","goals":null,"intro":"一条线段的某一部分与另一部分之比,如果正好等于另一部分同整个线段的比是0.618,即为黄金分割。","ratingnum":0,"rating":0,"hits":150,"teachername":"杨俊丽","publisheruid":0,"uid":83,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"14929","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":0,"admin":385,"createdtime":1477620042,"updatedtime":1495073099},{"id":2525,"catid":"10293,15823,12243,17236,25196,41507,44092,27005,43559,75254,26641,21346,99902,99954,98876","title":"平行线分线段成比例","subtitle":"平行线分线段成比例","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/3.png","goals":null,"intro":"三条平行线截两条直线,所得的四条线段对应成比例。如果一组平行线在一条直线上截得的线段相等,那么在其他直线上截得的线段也相等。","ratingnum":0,"rating":0,"hits":25,"teachername":"薛江辉","publisheruid":0,"uid":81,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":null,"admin":385,"createdtime":1492497933,"updatedtime":1495073022},{"id":2526,"catid":"10293,15830,21339,17235,25075,41506,44092,27006,43679,75302,26643,99903,21347,99053,99955","title":"相似图形","subtitle":"相似图形","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/2.png","goals":null,"intro":"两个图形的形状完全相同,但大小、位置不一定相同,这样的图形叫做相似图形。","ratingnum":0,"rating":0,"hits":20,"teachername":"薛江辉","publisheruid":0,"uid":81,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":null,"admin":385,"createdtime":1492498033,"updatedtime":1495072986},{"id":1701,"catid":"88793,15825,12239,17235,25078,41511,44095,27011,75307,26643,99903,10293,44092,21339,99053","title":"相似多边形的性质","subtitle":"相似多边形的性质","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/3.png","goals":null,"intro":"两个边数相同的多边形的对应角相等,对应边成比例,这两个多边形叫做相似多边形。\r\n\r\n","ratingnum":0,"rating":0,"hits":403,"teachername":"杨俊丽","publisheruid":0,"uid":83,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":0,"admin":385,"createdtime":1477620402,"updatedtime":1495072962}],"xdxk":{"2648":{"name":"小学数学","xd":1,"xk":3},"467":{"name":"初中数学","xd":2,"xk":3},"215":{"name":"初中英语","xd":2,"xk":4},"394":{"name":"初中科学","xd":2,"xk":5},"226":{"name":"初中物理","xd":2,"xk":6},"534":{"name":"初中化学","xd":2,"xk":7},"660":{"name":"初中历史与社会","xd":2,"xk":20}},"count":"53","catname":{"2455":"初中数学","1512":"初中数学","2413":"初中数学","1576":"初中数学","2523":"初中数学","2524":"初中数学","1700":"初中数学","2525":"初中数学","2526":"初中数学","1701":"初中数学"},"ispay":{"2455":0,"1512":0,"2413":0,"1576":0,"2523":0,"2524":0,"1700":0,"2525":0,"2526":0,"1701":0},"fmtime":{"2455":"2017-05-18 13:30","1512":"2017-05-18 13:30","2413":"2017-05-18 13:26","1576":"2017-05-18 11:31","2523":"2017-05-18 10:06","2524":"2017-05-18 10:05","1700":"2017-05-18 10:04","2525":"2017-05-18 10:03","2526":"2017-05-18 10:03","1701":"2017-05-18 10:02"},"videonum":{"2455":1,"1512":1,"2413":1,"1576":1,"2523":1,"2524":1,"1700":1,"2525":1,"2526":1,"1701":1},"pages":"
","page_items":"\n3/6"}