5/17X5/12X17 2(简便计算)

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5/17X5/12X17 2(简便计算)
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5/17X5/12X17 2(简便计算)
5/17X5/12X17 2(简便计算)

5/17X5/12X17 2(简便计算)
5/17X5/12X17
=5/17X17X5/12
=5X5/12
=25/12
=2又1/12