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(1)计算: ( 1 2 ) - 2 + ( 3 . 14 - π ) 0 + | 3 - 12 | - 4 sin 60 ° .
(2)先化简,再求值: ( 1 x - 1 - x + 1 ) ÷ x - 2 x 2 - 1 ,其中 x = 2 - 1 .
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