If the positive integer solution of inequality 3x-a ≤ 0 is 1, 2, 3, then the value range of a is 1______ .
If we solve the inequality 3x-a ≤ 0, we can get x ≤ A3. The positive integer solution of ∵ inequality is 1, 2, 3, 3 ≤ A3 < 4, and the solution is 9 ≤ a < 12. So the answer is: 9 ≤ a < 12
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