If the domain of function f (x + 1) is [0,1], then the domain of function f (3x-1) is [0,1]______ .

If the domain of function f (x + 1) is [0,1], then the domain of function f (3x-1) is [0,1]______ .

∵ if the definition field of function f (x + 1) is [0, 1], then 1 ≤ x + 1 ≤ 2. If the function f (3x-1) is meaningful, then 1 ≤ 3x-1 ≤ 2, then 23 ≤ x ≤ 1, so the definition field of function f (3x-1) is [23, 1], so the answer is: [23, 1]