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因為3f(x)-2f(1-x)=2x+3① 所以3f(1-x)-2f(x)=2(1-x)+3=-2x+5② ①*3+②*2 得到5f(x)=6x+9-4x+10=2x+19 所以f(x)=2x/5+19/5
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