（1）解方程：1-x2-x-3=1x-2；（2）计算0.25×（-2）-2÷（16）-1-（π-3）0；（3）先化简(x+1x-1+1x2-2x+1)÷xx-1，然后选取一个你喜欢的x的值代入计算．-

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