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不一定對啊… 設f(x)=kx+b 所以3[k(x+1)+b]-2[k(x-1)+b]=2x+17 整理得kx+5k+b=2x+17 根據係數對應kx=2x,5k+b=17 所以k=2,b=7 即f(x)=2x+7
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