如何保留表中数值有效数字，并删除重复项？
请问这样的一个表{
{1.330169884211280, 0.00001720546539834369},
{1.330169884211281, 0.00001720546539837174},
{1.330169884211280, 0.00001720546539835922},
{1.333982213287451, -8.175947591925948*10^-16},
{1.345036205430758, 0.0006351156440319828},
{1.335640955441090, 0.00001279787927890694},
{1.340810492417637, 0.00007171729478345468},
{1.347927753967533, 0.0007396072881434831},
{1.345036205430766, 0.0006351156440375747},
{1.340810492417637, 0.00007171729478342254},
{1.340810492417637, 0.00007171729478343141},
{1.345036205430766, 0.0006351156440376520},
{1.345036205430766, 0.0006351156440380904},
{1.345036205430766, 0.0006351156440381608},
{1.345036205430747, 0.0006351156440263690},
{1.345036205430766, 0.0006351156440375945}
}
如何让他只保留6为位有效数字，然后删除重复的元素。
或者说有什么别的方法直接删除数值几乎差不多的值？
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