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詳解 (共 1 筆)

詳解提供者：piano_chien

3x = 4x + 2y + 1 --> x + 2y = -1 ----(1)

2x - y + 5 = 13 --> 2x -y = 8 ----(2)

(2)*2 + (1) --> 5x = 15, x = 3

代入(1) --> 2y = -4, y = -2

x=3, y=-2