问题
填空题
设f(x+2)=2x+3,则f(x)=______.
答案
设x+2=t,则x=t-2,代入f(x+2)=2x+3得,
f(t)=2(t-2)+3=2t-1,
∴f(x)=2x-1,
故答案为:2x-1.
设f(x+2)=2x+3,则f(x)=______.
设x+2=t,则x=t-2,代入f(x+2)=2x+3得,
f(t)=2(t-2)+3=2t-1,
∴f(x)=2x-1,
故答案为:2x-1.