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因為y+m與x-n成正比例 設y+m=q(x-n)依題意有 3+m=q(2-n)1 -5+m=q(1-n)2 1-2,得q=8 將q=8帶入1,得8n+m=13 當x=-1時,y=8(-1-n)-m=-8n-m-8=-21
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