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4f(x)+3f(1/x)=x ① 令x=1/x 4f(1/x)+3f(x)=1/x ② ②*3/4 3f(1/x)+9f(x)/4=3/4x ③ ①-③ 9f(x)/4-4f(x)=3/4x -x f(x)=4x/7- 3/7x
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