問題詳情
2. 小明以加減消去法解聯立方程式：
若小明想消去 y 項，將○ 2 式×△，其中□、△均為正整數，則□＋△不可能是下列哪一個數？
(A)5
(B)10
(C)12
(D)20
參考答案
無參考答案
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