搜题请搜索小程序“爱下问搜题”
问题 填空题

已知y1＝x2－2x－3，y2＝x＋7，能使y1＝y2成立的x的取值为   ▲   ．

答案

首先根据题意得到方程x2-2x-3=x+7，然后移项合并同类项，再把方程的左边分解因式，即可解出方程的解．

解：∵y1=y2，

∴x2-2x-3=x+7，

x2-2x-3-x-7=0，

x2-3x-10=0，

∴（x-5）（x+2）=0，

x1=5，x2=-2．

故答案为：5或-2．

此题主要考查了因式分解法解一元二次方程，关键是熟练掌握因式分解法解一元二次方程的一般步骤：①移项，使方程的右边化为零；②将方程的左边分解为两个一次因式的乘积；③令每个因式分别为零，得到两个一元一次方程；④解这两个一元一次方程，它们的解就都是原方程的解．

多项选择题

欧洲资本主义较为发达的国家首先产生近代警察的原因是( )。

A．城市贫民的赤贫化，扩大了铤而走险的队伍

B．资本主义的生活方式毒化了社会风气，社会犯罪空前增长

C．在这些国家资本使社会形成无产阶级和资产阶级两大对立的阶级

D．资产阶级为了维护自己政治上的统治和经济上的残酷剥削，必然要强化警察的职能
查看答案
写作题

第二节读写任务（共1小题，满分25分）

阅读下面的短文，然后按照要求写一篇150词左右的英语短文。

In the past, the expression "children should be seen and not heard" summed up the attitude of parents to their children. Children were expected to be disciplined, well-behaved and the parents ruled the home. But today parents seem to do everything for their children and control all aspects of their lives. Some call this overparenting. Parents take charge of everything: from what pre-school their kids attend to the pastimes they take up. Parents feel they must protect their children to increase their chances for success. As a result children do less than ever before.

There are two reasons for overparenting. First, people now have fewer children than in years past so they can give each one more attention. Secondly, parents feel the future of their family is now dependent on only one child, so they must do as much as possible to help their child succeed.

But overparenting has negative consequences. Children are less independent now and are protected from the hardships and failures that teach them determination and give them the satisfaction of accomplishment. Also the pressure kids feel to be successful means they experience more anxiety and depression than ever before.

〔写作内容〕

1.以约30个词概括这段短文的内容；

2.然后以约120个词表达你对“父母过度照顾子女”这一现象的观点。内容包括：

(1)以你自己或他人成长的某次经历，说明父母过度照顾对子女的影响；

(2)表达你在此方面对父母的希望或建议。

［写作要求］

1.在作文中可使用自己的亲身经历或虚构的故事，也可以参照阅读材料的内容，但不得直接引用原文中的句子；

2.作文中不能出现真实姓名和学校名称。

［评分标准］   概括准确，语言规范，内容合适，篇章连贯。
查看答案