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【简答题】
设（3x-1） 6 =a 6 x 6 +a 5 x 5 +a 4 x 4 +a 3 x 3 +a 2 x 2 +a 1 x+a 0 ，求a 6 +a 5 +a 4 +a 3 +a 2 +a 1 +a 0 的值．
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