Dixon connected on 4-of-7 three-point tries as the Tigers (17-1, 4-1 Big 12) extended their best start to a season since 1981-82.
Marcus Denmon chipped in with 16 points and nine rebounds for Missouri.
Elston Turner and Khris Middleton led the Aggies (10-7, 1-4) with 13 points apiece.
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