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是 根據——只含有一個未知數,並且含有未知數的式子都是整式,未知數的次數是1,這樣的方程叫做一元一次方程. 就像是——x=1,y=2是二元一次方程組一樣 (believe me,偶們絕對N的老師都這樣教的)
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