已知函数f(X-1⼀X)=x^2+1⼀x^2,则f(3)=

A8B9C11D10求过程和步骤解释
2024-11-23 11:54:29
推荐回答(1个)
回答1:

f(x-1/x)=x²-2×x×1/x+1/x²+2×x×1/x
f(x-1/x)=(x-1/x)²+2
令3=(x-1/x),得f(3)=3²+2=11
答案C