计算: (0.027 ) - 1 3 -(- 1 7 ) -2 +(2 7 9 ) 1 2

计算: (0.027 ) - 1 3 -(- 1 7 ) -2 +(2 7 9 ) 1 2 -( 2 -1 ) 0 =______.

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