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◆本題理解起來有歧義. (1)若原題為(9乘10⁴;)的平方根,則解答如下: ±√(9×10⁴;)=±√90000=±300; (2)若原題為9乘(10⁴;的平方根,則解答如下: 9×(±√10⁴;)=9×(±100)=±900.
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