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其實很簡單的 將5x-y=120(1) 3y-11x=120(2) (1)×3=360 15x-3y=360(3) (3)+(2)=15x-3y+3y-11x=480 4x=480 x=120 將x=120代入(1) 得600-y=120 y=480 ∴x=120 y=480
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