用1至9组成的四位数字没有重复,全部写出来.（能写多少写多少）
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用1至9组成的四位数字没有重复,全部写出来.（能写多少写多少）
用1至9组成的四位数字没有重复,全部写出来.（能写多少写多少）
用1至9组成的四位数字没有重复,全部写出来.（能写多少写多少）
1230,1234,1235,1236,1237,1238,1239,1240,1245,1246,1247,1248,1249,1230,1234,1235,1236,1237,1238,1239,1240,1245,1246,1247,1248,1249,1250,1256,1257,1258,1259,1260,1267,1268,1269,1270,1278,1279,1280,1289,1290,1340,1345,1346,1347,1348,1349,1350,1356,1357,1358,1359,1360,1367,1368,1369,1370,1378,1379,1380,1389,1390,1402,1403,1405,1406,1407,1408,1409,1420,1423,1425,1426,1427,1428,1429,1430,1435,1436,1437,1438,1439,1450,1456,1457,1458,1459,1460,1467,1468,1469,1470,1478,1479,1480,1489,1490,14502,1503,1504,1506,1507,1508,1509,1520,1523,1524,1526,1527,1528,1529,1530,1532,1534,1536,1537,1538,1539,1540,1542,1543,1546,1547,1548,1549,1560,1562,1563,1564,1567,1568,1569,1570,1572,15731574157615781579,1580,1582,1583,1584,15861587,1589,1590,1592,1593,1594,1596,1597,1598,1601,1602,1603,1604,1605,1607,1608,1609,1620,1623,1624,1625,1627,1628,1629,1630,1634,1635,1637,1638,1639,1640,1642,1643,1645,1647,1648,1649,1650,1652,1653,1654,1657,1658,1659,1670,1672,1673,1674,1675,1678,1679,1680,1682,1683,1684,1685,1687,1689,1690,1692,1693,1694,1695,1697,1698,1702,1703,1704,1705,1706,1708,1709,1720,1723,1724,1725,1726,1728,1729,1730,1732,1734,1735,1736,1738,1739,1740,1742,1743,1745,1746,1748,1749,1750,1752,1753,1754,1756,1578,1759,1760,1762,1763,1764,1765,1768,1769,1780,1782,1783,1784,1785,1786,1789,1790,1792,1793,1794,1795,1796,1798,1790