[問題]一題本利和的題目，懇請幫忙
詳解第二行的等號右邊我看不懂是什麼意思。
請問有人能幫忙解釋他是什麼，從何處來，將往何處去嗎？
感激不盡。
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※ 編輯: yuklious (1.171.138.47), 03/24/2016 01:32:02
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