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在-1.732,,π, 2+,3.212212221…,3.14这些数中,无理数的个数为( ).

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A. which    where    that    what  
$1.732  $$1.732  $1732  $$0001.732  
A. which    where    that    what  
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3  3或﹣3  0  ﹣3  
$1.732  $S1.732  $1732  $$0001.732  
A. which    where    that    what  
         
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$1.732  $S1.732  $1732  $$0001.732  
$1.732  $$1.732  $1732  $$0001.732  
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