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Senior one mathematics compulsory course 1.2A group's first question is answered in detail.
( 1)x-4≠0∴x≠4∴{ x2008； x ≠ 4}

(2)x∈R

(3)x？ -3x+2 ≠ 0 ∴ {x ≠ x≠ 1 and x ≠ 2}

(4)4-x≥0 and X- 1 ≠ 0 ∴ {X ≠ x≠ 1 and X ≤ 4}

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