5.()瑄瑄利用加減消去法解聯立方程式時,下列哪一步驟可以消去y? (A)(1)x4-(2)x5 (B)(1)x4 + (2)x5 (C)(1)x2 -(2)x7 (D)(1)x2 + (2)x7

問題詳情

5.()瑄瑄利用加減消去法解聯立方程式

時,下列哪一步驟可以消去y?

(A)(1)x4-(2)x5
(B)(1)x4 + (2)x5
(C)(1)x2 -(2)x7
(D)(1)x2 + (2)x7

參考答案