计算：-八年级数学

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• 若，则=.-八年级数学
• 若＜1，化简的结果是（）A．a－１B．－a－１C．１－aD．a＋１-九年级数学
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• 计算：①②-八年级数学
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• 下列运算正确的是[]A．B．C．D．-九年级数学
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• 若，则。-九年级数学
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• （本题满分8分）先将化简，然后选取一个你喜欢的a的值，代入求值．-九年级数学