A Korean survey shows that shopping cart handles are the most bacteria-carrying items among some __

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• 化简：（1）（2x+3）2-（3x+2）2（2）4a2（a-b）（a+b）-（2a2-b2）（2a2+b2）（3）用乘法公式简便运算：20012（4）计算：[-5+3×（56）0]-1-[（-a）15
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