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在一元方程裏代表一個未知數(變數) 在二元方程裏代表與另一未知數(變數)相關的一個未知數(變數)
n ∑a(i) i=1 表示a(1)+a(2)+…+a(n) i=1表示從a(1)開始 a(n)表示到結束
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