搜题请搜索小程序“爱下问搜题”
问题 计算题

分解因式：

（1）-x3+2x2-x；

（2）a2-b2+2b-1。

答案

解：（1）原式=-x（x2-2x+1）=-x（x-1）2；

（2）原式=a2-（b2-2b+1）=a2-（b-1）2=（a+b-1）（a-b+1）。

改错题

     假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处

语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

     增加：在缺词处加一个漏字符号(^)，并在其下面写出该加的词。

     删除：把多余的词用斜线(＼)划掉。

     修改：在错误的词下划一横线，并在该词下面写出修改后的词。

     注意： 1.每处错误及其修改均仅限一词。 

                 2.只允许修改10处，多者（从第11处起）不计分。

     Almost all parents in China hope their son or daughter will have happy future. They are very strict with

their children, and so do teachers in schools! Many children are giving so much home- work that they have

hardly any spare time to have sports. The children are forbidden to do anything but to study. There is no

wonder there're so many children are tired of their lessons. Some even attack or kill their parents or teachers!

I strong believe many people had already read this kind of news in newspapers or magazines. Shouldn't we

draw a lesson from the accident? Now our government is carrying on a plan to solve the education problems.

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多项选择题

现金等价物应同时具备的条件是（）。

A.能够转换为已知金额的现金

B.期限短

C.流动性强

D.价值变动风险小
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