计算：（1）32×2-4÷(-17)0（2）（2x2y）3-（-7xy2）÷（14x4y3）（3）（x-5）2-（x-2）（x-3）（4）[（a+b）（a-b）+（a+b）2-2a2]÷（-2a）-数

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