Question

一道高一函数与数列结合的综合题（高手请进!）

Answer 1

1 f(1)=3 a+b=2c+3df(-1)=-3 a-b=2c-3d a=2c b=3df(x)=(ax²+bx+c)/（cx+d）=(2x²+3d/cx+1)/（x+d/c)=(2(x²+2d/cx+d^2/c^2)-d/cx-d^2/c^2+1-d^2/c^2)/（x+d/c)=2（x+d/c)-d/c+(1-d^2/c^2)/（x+d/c)>=2...