{"show":[{"id":2169,"catid":"11633,77549,14818,77201,24940,25354,70381,26839,18588,75115,26375,91425,11632,117969,10201","title":"正数和负数","subtitle":"正数和负数","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/3.png","goals":null,"intro":"正数是指比0大的实数。正数前面常有一个符号“+”，但通常可以省略不写。\r\n","ratingnum":0,"rating":0,"hits":408,"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":1489126900,"updatedtime":1495097049},{"id":467,"catid":"88280,11634,9909,14820,15003,24944,25355,70382,26840,18587,75116,26376","title":"数轴","subtitle":"数轴","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/2.png","goals":null,"intro":"规定了原点、正方向和单位长度的直线叫做数轴．\r\n","ratingnum":0,"rating":0,"hits":393,"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":1476934533,"updatedtime":1495097024},{"id":2172,"catid":"88281,11634,9909,14822,17360,24945,25356,70382,18587,75117,26377,26841","title":"相反数","subtitle":"相反数","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/4.png","goals":null,"intro":"只有符号不同的两个数,我们就说其中一个数是另一个数的相反数。零的相反数是零。\r\n\r\n","ratingnum":0,"rating":0,"hits":89,"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":1489127145,"updatedtime":1495097014},{"id":2173,"catid":"88283,11635,9910,17360,24946,25356,70382,26841,18586,75117,26377,14823","title":"绝对值","subtitle":"绝对值","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/3.png","goals":null,"intro":"在数轴上，表示一个数的点到原点的距离叫做这个数的绝对值。实数a的绝对值用“|a|”来表示。（这里的数a可以是正数、负数和0）\r\n","ratingnum":0,"rating":0,"hits":65,"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":1489127336,"updatedtime":1495096897},{"id":2174,"catid":"17358,24951,25362,70385,26846,26382,17467,95273,24952","title":"倒数","subtitle":"倒数","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/4.png","goals":null,"intro":"两个实数的乘积是1，则这两个数互为倒数。反之也成立：若a、b互为倒数,则ab=1\r\n","ratingnum":0,"rating":0,"hits":55,"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":1489127561,"updatedtime":1495096892},{"id":2175,"catid":"88283,11636,9910,14824,17360,24942,89967,70383,26841,18586,75117,26377,94123,75116","title":"有理数大小比较","subtitle":"有理数大小比较","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/3.png","goals":null,"intro":"在数轴上的两点，右边的点表示的数比左边的大。反过来，左边的点表示的数比右边的小。\r\n","ratingnum":0,"rating":0,"hits":65,"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":1489127692,"updatedtime":1495096885},{"id":2176,"catid":"11909,9915,14834,17358,24950,25361,70385,18583,75119,26381,94129,17467,26845,95273","title":"有理数的乘法用运算律简化运算","subtitle":"有理数的乘法用运算律简化运算","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/5.png","goals":null,"intro":"乘法交换律是两个数相乘，交换因数的位置，积不变。\r\n","ratingnum":0,"rating":0,"hits":70,"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":1489127857,"updatedtime":1495096782},{"id":2180,"catid":"88426,11906,9918,14837,17356,24953,25364,70386,26848,18580,75121,26384,17468","title":"有理数的混合运算","subtitle":"有理数的混合运算","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/2.png","goals":null,"intro":"只有同级运算的从左到右依次运算。有不同级运算有理数混合运算中，先算乘方，再算乘除，最后算加减。\r\n","ratingnum":0,"rating":0,"hits":65,"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":1489129192,"updatedtime":1495096763},{"id":473,"catid":"100312,88430,11905,14838,70387,93696","title":"近似数","subtitle":"近似数","status":4,"type":"normal","price":30,"serializemode":0,"lessonnum":0,"smallpicture":"/dist/images/defaultcover/math/1.png","goals":null,"intro":"由测量得到或使用四舍五入法得到的与实际非常接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