已知函数f(x)=2x+1(1≤x≤3),则( )
(A)f(x-1)=2x+2(0≤x≤2)
(B)f(x-1)=2x-1(2≤x≤4)
(C)f(x-1)=2x-2(0≤x≤2)
(D)f(x-1)=-2x+1(2≤x≤4)
已知函数f(x)=2x+1(1≤x≤3),则( )
(A)f(x-1)=2x+2(0≤x≤2)
(B)f(x-1)=2x-1(2≤x≤4)
(C)f(x-1)=2x-2(0≤x≤2)
(D)f(x-1)=-2x+1(2≤x≤4)
B.∵f(x)=2x+1,
∴f(x-1)=2(x-1)+1=2x-1,
且1≤x-1≤3,∴2≤x≤4,
∴f(x-1)=2x-1(2≤x≤4).