Calculation: 321 × 654 ﹣ 987 ﹣ 654 × 987 ﹣ 321=______ ．

321 × 654 ／ 987 ／ 654 × 987 ／ 321, = (321 ／ 321) × (654 ／ 654) ／ 987 × 987, = 1 × 1 ／ 987 × 987, = 1

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1. It is proved that if P is prime, then the ratio of root P is irrational
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3. (987*655-321)/(666+987*654)
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