化简的结果是（）。-九年级数学

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• 计算：-八年级数学
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• 计算：。-八年级数学
• 计算：。-九年级数学
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• 计算：-八年级数学
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• 计算：-八年级数学
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• 化简：-八年级数学
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• 化简：。-八年级数学
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• 计算：-八年级数学
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• 计算：-八年级数学
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• 计算：。-八年级数学
• 计算：（1）；（2）。-八年级数学
• 计算：=（）。-八年级数学
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• 计算-八年级数学
• 下列各运算中，错误的个数是30+3-1=-3；②；③（2a2）3=8a5；④-a8÷a4=-a4[]A、1B、2C、3D、4-九年级数学
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