计算：=_____．-八年级数学

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• 计算=（）。-八年级数学
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• -八年级数学
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• 计算=（）。-九年级数学
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• 下列运算正确的是[]A．3a3×2a2=6a6B．4a2÷2a2=2aC．3=2D．-九年级数学
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