题干

用字母表示同底数幂的乘法法则,并写出推导过程及每一步的依据.
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答案(点此获取答案解析)

解:同底数幂的乘法法则:am•an=a m+n(m,n是正整数),

推导:

am•an aa

同类题3

书面表达

假如你是某英语杂志社编辑王林,根据下面中学生小明的来信,给他写一封回信,解答他的困惑。

要求:1. 观点鲜明,结构合理,内容连贯;

2. 词数80左右,信的开头和落款已给出,不计入总词数。

Dear editor,

   Nowadays, many junior high school students are completely getting relaxed from busy study after graduation,  so what they would like to do most is to throw books away, hang out with friends at daytime and stay up late at night playing computer games or watching TV. What's your opinion about this? I'm looking forward to your reply.

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         Xiaoming

Dear Xiaoming,

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Yours,

Wang Lin