f(x-1分之x+1)=3f(x)-2x,求f(x)
以上解答满意了么?
令t=(x+1)/(x-1)→x=(t+1)/(t-1)
f[(t+1)/(t-1)]=3f(t)-2t=3f[(x+1)/(x-1)]-2(x+1)/(x-1)
f(x)=3f[(x+1)/(x-1)]-2(x+1)/(x-1)
y1=f(x),y2=f[(x+1)/(x-1)]
y1=3y2--2(x+1)/(x-1)
y2=3y1-2x
y1=3*(3y1-2x)-2(x+1)/(x-1)
以下略
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