搜题请搜索小程序“爱下问搜题”
问题 填空题

把多项式6a3﹣54a分解因式的结果为　　．

答案

6a（a+3）（a﹣3）

题目分析：先提取公因式6a，再根据平方差公式进行二次分解．

解：6a3﹣54a=6a（a2﹣9）=6a（a+3）（a﹣3）．

故答案为：6a（a+3）（a﹣3）．

点评：本题考查了提公因式法，公式法分解因式．注意提取公因式后利用平方差公式进行二次分解，分解要彻底．

单项选择题

城市热岛效应是指城市中的气温明显（）的现象。

A、高于外围郊区

B、低于外围郊区
查看答案
单项选择题

Ravi, like many project (126) , had studied the waterfall model of software development as the primary software life-cycle (127) . He was all set to use it for an upcoming project, his first assignment. However, Ravi found that the waterfall model could not be used because the customer wanted the software delivered in stages, something that implied that the system had to be delivered and built in (128) and not as (129) .
The situation in many other projects is not very different. The real world rarely presents a problem in which a standard process, or the process used in a previous project, is the best choice. To be the most suitable, an existing process must be (130) to the new problem. A development process, even after tailoring, generally cannot handle change requests. To accommodate change requests without losing control of the project, you must supplement the development process with a requirement change management process.

A．modified

B．used

C．suited

D．tailored
查看答案