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這個題目很難說,因為是圖形題目.x-y-2化了以後就是(因為已知y=3x=3)x-(3x+3)-2就是-2x-5建議你先把y的函數圖畫出來,把-2x-5的函數圖也畫出來,這樣你就好做了第二題的答案應該是-2x+10(不知道對不對)
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