计算：（﹣）2﹣（）﹣2=_________．-七年级数学

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• 3﹣2=_________．-七年级数学
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• 计算：=_________．-七年级数学
• 下列说法：①2a﹣2=；②用小数表示3×10﹣2为﹣0.03；③（4x3y2）2=8x6y4；④（x2）n+1÷x2n=x2，其中正确的有[]A．1个B．2个C．3个D．4个-七年级数学
• 计算2﹣2的值是[]A．4B．﹣4C．D．-七年级数学
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• 2﹣1+20=_________．-七年级数学
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• 下列运算中，正确的是[]A．x2007+x2008=x4015B．20070=0C．D．（﹣a）（﹣a）2=﹣a3-七年级数学
• 计算2﹣2的结果是[]A．4B．﹣4C．D．﹣-七年级数学
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• 的值等于[]A．B．﹣C．9D．﹣9-七年级数学
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• =_________．-七年级数学
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• 下列各式计算正确的是[]A．（）﹣3=27B．a3a2=a6C．（﹣2a3）﹣3=6a﹣9D．a3+a2=a5-七年级数学
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