{"show":[{"id":2191,"catid":"88426,70386,26847,75120,24952","title":"平方的非负性","subtitle":"平方的非负性","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/5.png","goals":null,"intro":"一个数的平方是此数与它的本身相乘所得的乘积，这个乘积一定是非负性的。\r\n","ratingnum":0,"rating":0,"hits":43,"teachername":"刘红蕾","publisheruid":0,"uid":83,"xd":2,"deletedtime":null,"xk":3,"nj":null,"ver":"","locked":0,"grade":0,"stage":3,"comment":"","remark":"","recommend":null,"admin":385,"createdtime":1489366002,"updatedtime":1495096032},{"id":492,"catid":"17360,88283,14823,70382,26841,11635,9910,24946,25356,18586,75117,26377","title":"绝对值的非负性","subtitle":"绝对值的非负性","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/2.png","goals":null,"intro":"什么是绝对值的非负性？怎么利用绝对值非负性？这些都是必须掌握的相关绝对值知识。\r\n\r\n","ratingnum":0,"rating":0,"hits":152,"teachername":"刘红蕾","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":1476941660,"updatedtime":1495095974},{"id":500,"catid":"88428,77551,75122","title":"科学计算器的使用","subtitle":"科学计算器的使用","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/5.png","goals":null,"intro":"只有先认识科学计算器，才能更好地使用科学计算器。","ratingnum":0,"rating":0,"hits":360,"teachername":"刘红蕾","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":1476942004,"updatedtime":1495095902},{"id":1173,"catid":"21688,21689,21690","title":"数学常识","subtitle":"数学常识","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/2.png","goals":null,"intro":"生活中数学无处不在，你家面积多大？你有多高？从家到学校走什么样的路最近？这些都蕴含了数学的智慧。","ratingnum":0,"rating":0,"hits":58,"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":1477447327,"updatedtime":1495095588},{"id":501,"catid":"100309,10234,77684,12337,10024,16446,17052,25054,41405,27265,26934,19321,75267,26521,94160,95131","title":"平方根","subtitle":"平方根","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/4.png","goals":null,"intro":"一般将平方根的定义为如果一个数x的平方等于a， 那么这个数x就叫做a的平方根。\r\n","ratingnum":0,"rating":0,"hits":49,"teachername":"刘红蕾","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":1476942291,"updatedtime":1495095427},{"id":2192,"catid":"10234,77684,12337,10024,16446,17052,25054,41405,27265,26934,19321,75263,26521,94160,95127,21335","title":"算术平方根","subtitle":"算术平方根","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/6.png","goals":null,"intro":"算术平方根的定义：一般地，如果一个正数x的平方等于a,即 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16:27","492":"2017-05-18 16:26","500":"2017-05-18 16:25","1173":"2017-05-18 16:19","501":"2017-05-18 16:17","2192":"2017-05-18 16:16","502":"2017-05-18 16:07","503":"2017-05-18 16:05","511":"2017-05-18 16:05","2193":"2017-05-18 16:02"},"videonum":{"2191":1,"492":1,"500":1,"1173":1,"501":1,"2192":1,"502":1,"503":1,"511":1,"2193":1},"pages":"    <ul class=\"g-pager\">\n                <li class=\"item prev\"><a href=\"/course/ajax-get-course?cid=0&nj=0&kid=0&type=updatedtime&page=2&per-page=10\">上一页</a></li>\n                                <li class=\"item \">\n            <a href=\"/course/ajax-get-course?cid=0&nj=0&kid=0&type=updatedtime&page=1&per-page=10\">1</a>\n        </li>\n                <li class=\"item \">\n            <a href=\"/course/ajax-get-course?cid=0&nj=0&kid=0&type=updatedtime&page=2&per-page=10\">2</a>\n        </li>\n                <li class=\"item active\">\n            <a href=\"javascript:;\">3</a>\n        </li>\n                <li class=\"item \">\n         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