计算：2-1+20÷5=______．-数学

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• （1）计算：（-1）2009+3（tan60°）-1-|1-3|+（3.14-π）0；（2）先化简，再选择一个合适的x值代入求值：(xx+1+1)÷(1-3x21-x2)•1x-1．-数学
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