计算2﹣2的结果是[]A．4B．﹣4C．D．﹣-七年级数学

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• =_________．-七年级数学
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• 计算（2﹣1）2结果等于[]A．2B．4C．D．-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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