计算（1）a+9b3ab-a+3b3ab（2）x2-1(x-1)2÷1x-1•1x+1（3）先将代数式：（x+2x-2+4x2-4x+4）÷xx-2化简，然后请你选取一个你喜欢且又合理的x的值，再求原

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