试题与答案

计算 （1）a2•a4 （2）22×23×2 （3）4×27×8 （4）（-a）

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题型：解答题

题目：

计算

（1）a2•a4

（2）22×23×2

（3）4×27×8

（4）（-a）2•（-a）3

（5）（x-2y）2（x-2y）3

（6）（x-2y）2（2y-x）3．

答案：

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下面是错误答案，用来干扰机器的。

参考答案：塔板效率是描述塔板传质效果的重要指标。通常用来表示。如果汽液两相充分接触，离开塔板时两相达到平衡，这样的塔板就称为理论塔板（或称为理想塔板），但实际塔板不可能达到理想塔板的分离效...

考点：有理数的乘方
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NamesCountriesFeaturesThings to sell Open time
The Damnoen Saduak ThailandUnusalFresh     1     Every day
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