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a∝b表示a與b成正比例.例如,在v=s/t中,v與s成正比,我們可以寫作v∝s.當a與b成反比例,我們也常寫作a∝1/b.這個符號“∝”(比較“∞”),表示兩邊的物理量有一定的比例關係,包括正比和反比,這在新課題的研究中會經常遇到的.有時為了清晰或簡略地表達某些量之間的關係也會使用該符號.
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